GNU bug report logs - #52676
28.0.50; [PATCH] Rationalize window-text-pixel-size

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: dick <dick.r.chiang <at> gmail.com>
To: bug-gnu-emacs <bug-gnu-emacs <at> gnu.org>
Subject: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Sun, 19 Dec 2021 21:32:15 -0500

[0001-Rationalize-window-text-pixel-size.patch (text/x-diff, inline)]

From 11ce84b93df374e43d91b46cc84cede12893d1b0 Mon Sep 17 00:00:00 2001
From: dickmao <dick.r.chiang <at> gmail.com>
Date: Sun, 19 Dec 2021 21:23:15 -0500
Subject: [PATCH] Rationalize window-text-pixel-size

Even if 43c4cc2 did anything (it doesn't), it was obviously
the wrong way to go about it.

Then I saw 914cb7a, I had to do something about it.

* doc/lispref/display.texi (Size of Displayed Text): Revert.
* src/pgtkfns.c (Fx_show_tip): Revert.
* src/xdisp.c (window_text_pixel_size): De-obfuscate.
(Fwindow_text_pixel_size): Revert.
(Fbuffer_text_pixel_size): Revert.
* src/xfns.c (Fx_show_tip): Revert.
* test/lisp/emacs-lisp/multisession-tests.el (multi-test--on-conflict-p,
multi-test-sqlite-simple, multi-test-sqlite-busy, multi-test-files-simple,
multi-test-files-busy, multi-test-files-some-values):
You gotta do what you gotta do.
* test/src/xdisp-tests.el (xdisp-tests--visible-buffer):
`with-temp-buffer` won't cut it for xdisp tests.
(xdisp-tests--reconnoiter-image-height,
xdisp-tests--scroll-down-leaves-cursor-behind,
xdisp-tests--window-text-pixel-size-single-sline,
xdisp-tests--window-text-pixel-size-display-property): Test stuff.
---
 doc/lispref/display.texi                   |   8 +-
 src/pgtkfns.c                              |   3 +-
 src/w32fns.c                               |   3 +-
 src/xdisp.c                                | 154 +++++----------------
 src/xfns.c                                 |   3 +-
 test/lisp/emacs-lisp/multisession-tests.el |  81 +++++++----
 test/src/xdisp-tests.el                    |  66 +++++++++
 7 files changed, 152 insertions(+), 166 deletions(-)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 98a15404f9..dd996fbe4a 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -2086,7 +2086,7 @@ Size of Displayed Text
 (@pxref{Resizing Windows}) to make a window exactly as large as the text
 it contains.
 
-@defun window-text-pixel-size &optional window from to x-limit y-limit mode-lines ignore-line-at-end
+@defun window-text-pixel-size &optional window from to x-limit y-limit mode-lines
 This function returns the size of the text of @var{window}'s buffer in
 pixels.  @var{window} must be a live window and defaults to the
 selected one.  The return value is a cons of the maximum pixel-width
@@ -2136,12 +2136,6 @@ Size of Displayed Text
 height of all of these lines, if present, in the return value.
 @end defun
 
-The optional argument @var{ignore-line-at-end} controls whether or
-not to count the height of text in @var{to}'s screen line as part of
-the returned pixel-height.  This is useful if your Lisp program is
-only interested in the dimensions of text up to and excluding the
-visual beginning of @var{to}'s screen line.
-
 @code{window-text-pixel-size} treats the text displayed in a window as a
 whole and does not care about the size of individual lines.  The
 following function does.
diff --git a/src/pgtkfns.c b/src/pgtkfns.c
index 44e3d2a37e..1a4f08ca7d 100644
--- a/src/pgtkfns.c
+++ b/src/pgtkfns.c
@@ -3474,8 +3474,7 @@ DEFUN ("x-show-tip", Fx_show_tip, Sx_show_tip, 1, 6, 0,
   try_window (window, pos, TRY_WINDOW_IGNORE_FONTS_CHANGE);
   /* Calculate size of tooltip window.  */
   size = Fwindow_text_pixel_size (window, Qnil, Qnil, Qnil,
-				  make_fixnum (w->pixel_height), Qnil,
-				  Qnil);
+				  make_fixnum (w->pixel_height), Qnil);
   /* Add the frame's internal border to calculated size.  */
   width = XFIXNUM (Fcar (size)) + 2 * FRAME_INTERNAL_BORDER_WIDTH (tip_f);
   height = XFIXNUM (Fcdr (size)) + 2 * FRAME_INTERNAL_BORDER_WIDTH (tip_f);
diff --git a/src/w32fns.c b/src/w32fns.c
index 02a6d78b51..65463b5261 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -7525,8 +7525,7 @@ DEFUN ("x-show-tip", Fx_show_tip, Sx_show_tip, 1, 6, 0,
   try_window (window, pos, TRY_WINDOW_IGNORE_FONTS_CHANGE);
   /* Calculate size of tooltip window.  */
   size = Fwindow_text_pixel_size (window, Qnil, Qnil, Qnil,
-				  make_fixnum (w->pixel_height), Qnil,
-				  Qnil);
+				  make_fixnum (w->pixel_height), Qnil);
   /* Add the frame's internal border to calculated size.  */
   width = XFIXNUM (Fcar (size)) + 2 * FRAME_INTERNAL_BORDER_WIDTH (tip_f);
   height = XFIXNUM (Fcdr (size)) + 2 * FRAME_INTERNAL_BORDER_WIDTH (tip_f);
diff --git a/src/xdisp.c b/src/xdisp.c
index 0c35d24c26..d5101457c7 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -10827,22 +10827,22 @@ in_display_vector_p (struct it *it)
 	  && it->dpvec + it->current.dpvec_index != it->dpend);
 }
 
-/* This is like Fwindow_text_pixel_size but assumes that WINDOW's buffer
-   is the current buffer.  Fbuffer_text_pixel_size calls it after it has
-   set WINDOW's buffer to the buffer specified by its BUFFER_OR_NAME
-   argument.  */
+/* Return cons pair of WINDOW's cartesian dimensions.  */
+
 static Lisp_Object
 window_text_pixel_size (Lisp_Object window, Lisp_Object from, Lisp_Object to,
 			Lisp_Object x_limit, Lisp_Object y_limit,
-			Lisp_Object mode_lines, Lisp_Object ignore_line_at_end)
+			Lisp_Object mode_lines)
 {
   struct window *w = decode_live_window (window);
   struct it it;
   ptrdiff_t start, end, bpos;
   struct text_pos startp;
   void *itdata = NULL;
-  int c, max_x = 0, max_y = 0, x = 0, y = 0;
-  int doff = 0;
+  int c, x = 0, y = 0, start_x = 0, start_vpos = 0;
+
+  int max_x = (RANGED_FIXNUMP (0, x_limit, INT_MAX)) ? XFIXNUM (x_limit) : INT_MAX;
+  int max_y = (RANGED_FIXNUMP (0, y_limit, INT_MAX)) ? XFIXNUM (y_limit) : INT_MAX;
 
   if (NILP (from))
     {
@@ -10902,121 +10902,29 @@ window_text_pixel_size (Lisp_Object window, Lisp_Object from, Lisp_Object to,
   else
     end = clip_to_bounds (start, fix_position (to), ZV);
 
-  if (RANGED_FIXNUMP (0, x_limit, INT_MAX))
-    max_x = XFIXNUM (x_limit);
-  else if (!NILP (x_limit))
-    max_x = INT_MAX;
-
-  if (NILP (y_limit))
-    max_y = INT_MAX;
-  else if (RANGED_FIXNUMP (0, y_limit, INT_MAX))
-    max_y = XFIXNUM (y_limit);
-
   itdata = bidi_shelve_cache ();
+
   start_display (&it, w, startp);
-  int start_y = it.current_y;
-  /* It makes no sense to measure dimensions of region of text that
-     crosses the point where bidi reordering changes scan direction.
-     By using unidirectional movement here we at least support the use
-     case of measuring regions of text that have a uniformly R2L
-     directionality, and regions that begin and end in text of the
-     same directionality.  */
-  it.bidi_p = false;
-
-  /* Start at the beginning of the line containing FROM.  Otherwise
-     IT.current_x will be incorrectly set to zero at some arbitrary
-     non-zero X coordinate.  */
+  it.last_visible_x = min (it.last_visible_x, max_x);
+
   reseat_at_previous_visible_line_start (&it);
   it.current_x = it.hpos = 0;
-  if (IT_CHARPOS (it) != start)
-    move_it_to (&it, start, -1, -1, -1, MOVE_TO_POS);
-
-  /* Now move to TO.  */
-  int start_x = it.current_x;
-  int move_op = MOVE_TO_POS | MOVE_TO_Y;
-  int to_x = -1;
-  it.current_y = start_y;
-  /* If FROM is on a newline, pretend that we start at the beginning
-     of the next line, because the newline takes no place on display.  */
-  if (FETCH_BYTE (start) == '\n')
-    it.current_x = 0;
-  if (!NILP (x_limit))
-    {
-      it.last_visible_x = max_x;
-      /* Actually, we never want move_it_to stop at to_x.  But to make
-	 sure that move_it_in_display_line_to always moves far enough,
-	 we set to_x to INT_MAX and specify MOVE_TO_X.  */
-      move_op |= MOVE_TO_X;
-      to_x = INT_MAX;
-    }
-
-  void *it2data = NULL;
-  struct it it2;
-  SAVE_IT (it2, it, it2data);
-
-  x = move_it_to (&it, end, to_x, max_y, -1, move_op);
-
-  /* We could have a display property at END, in which case asking
-     move_it_to to stop at END will overshoot and stop at position
-     after END.  So we try again, stopping before END, and account for
-     the width of the last buffer position manually.  */
-  if (IT_CHARPOS (it) > end)
-    {
-      end--;
-      RESTORE_IT (&it, &it2, it2data);
-      x = move_it_to (&it, end, to_x, max_y, -1, move_op);
-      /* Add the width of the thing at TO, but only if we didn't
-	 overshoot it; if we did, it is already accounted for.  Also,
-	 account for the height of the thing at TO.  */
-      if (IT_CHARPOS (it) == end)
-	{
-	  x += it.pixel_width;
-
-	  /* DTRT if ignore_line_at_end is t.  */
-	  if (!NILP (ignore_line_at_end))
-	    doff = (max (it.max_ascent, it.ascent)
-		    + max (it.max_descent, it.descent));
-	  else
-	    {
-	      it.max_ascent = max (it.max_ascent, it.ascent);
-	      it.max_descent = max (it.max_descent, it.descent);
-	    }
-	}
-    }
-  else
-    bidi_unshelve_cache (it2data, true);
+  move_it_to (&it, start, -1, -1, -1, MOVE_TO_POS);
+  start_x = it.current_x;
+  start_vpos = it.vpos;
 
-  if (!NILP (x_limit))
-    {
-      /* Don't return more than X-LIMIT.  */
-      if (x > max_x)
-        x = max_x;
-    }
+  x = move_it_to (&it, end, -1, max_y, -1, MOVE_TO_POS | MOVE_TO_Y);
+  x = min (x, max_x);
 
-  /* If text spans more than one screen line, we don't need to adjust
-     the x-span for start_x, since the second and subsequent lines
-     will begin at zero X coordinate.  */
-  if (it.current_y > start_y)
-    start_x = 0;
-
-  /* Subtract height of header-line and tab-line which was counted
-     automatically by start_display.  */
-  if (!NILP (ignore_line_at_end))
-    y = (it.current_y + doff
-	 - WINDOW_TAB_LINE_HEIGHT (w)
-	 - WINDOW_HEADER_LINE_HEIGHT (w));
-  else
-    y = (it.current_y + it.max_ascent + it.max_descent + doff
-	 - WINDOW_TAB_LINE_HEIGHT (w) - WINDOW_HEADER_LINE_HEIGHT (w));
-
-  /* Don't return more than Y-LIMIT.  */
-  if (y > max_y)
-    y = max_y;
+  /* Subtract header- and tab-line included by start_move_it().  */
+  y = it.current_y + it.max_ascent + it.max_descent
+    - WINDOW_TAB_LINE_HEIGHT (w) - WINDOW_HEADER_LINE_HEIGHT (w);
+  y = min (y, max_y);
 
   if ((EQ (mode_lines, Qtab_line) || EQ (mode_lines, Qt))
       && window_wants_tab_line (w))
-    /* Add height of tab-line as requested.  */
     {
+      /* Add height of tab-line as requested.  */
       Lisp_Object window_tab_line_format
 	= window_parameter (w, Qtab_line_format);
 
@@ -11052,10 +10960,15 @@ window_text_pixel_size (Lisp_Object window, Lisp_Object from, Lisp_Object to,
 
   bidi_unshelve_cache (itdata, false);
 
-  return Fcons (make_fixnum (x - start_x), make_fixnum (y));
+  /* X is widest line seen by move_it_forwards() */
+  return Fcons (make_fixnum
+		(it.vpos == start_vpos
+		 ? x - start_x /* START to END same sline */
+		 : x),
+		make_fixnum (y));
 }
 
-DEFUN ("window-text-pixel-size", Fwindow_text_pixel_size, Swindow_text_pixel_size, 0, 7, 0,
+DEFUN ("window-text-pixel-size", Fwindow_text_pixel_size, Swindow_text_pixel_size, 0, 6, 0,
        doc: /* Return the size of the text of WINDOW's buffer in pixels.
 WINDOW must be a live window and defaults to the selected one.  The
 return value is a cons of the maximum pixel-width of any text line
@@ -11102,12 +11015,9 @@ DEFUN ("window-text-pixel-size", Fwindow_text_pixel_size, Swindow_text_pixel_siz
 height of the mode-, tab- or header-line of WINDOW in the return value.
 If it is the symbol `mode-line', 'tab-line' or `header-line', include
 only the height of that line, if present, in the return value.  If t,
-include the height of any of these, if present, in the return value.
-
-IGNORE-LINE-AT-END, if non-nil, means to not add the height of the
-screen line that includes TO to the returned height of the text.  */)
+include the height of any of these, if present, in the return value.  */)
   (Lisp_Object window, Lisp_Object from, Lisp_Object to, Lisp_Object x_limit,
-   Lisp_Object y_limit, Lisp_Object mode_lines, Lisp_Object ignore_line_at_end)
+   Lisp_Object y_limit, Lisp_Object mode_lines)
 {
   struct window *w = decode_live_window (window);
   struct buffer *b = XBUFFER (w->contents);
@@ -11120,8 +11030,7 @@ DEFUN ("window-text-pixel-size", Fwindow_text_pixel_size, Swindow_text_pixel_siz
       set_buffer_internal_1 (b);
     }
 
-  value = window_text_pixel_size (window, from, to, x_limit, y_limit, mode_lines,
-				  ignore_line_at_end);
+  value = window_text_pixel_size (window, from, to, x_limit, y_limit, mode_lines);
 
   if (old_b)
     set_buffer_internal_1 (old_b);
@@ -11171,8 +11080,7 @@ DEFUN ("buffer-text-pixel-size", Fbuffer_text_pixel_size, Sbuffer_text_pixel_siz
       set_marker_both (w->old_pointm, buffer, BEG, BEG_BYTE);
     }
 
-  value = window_text_pixel_size (window, Qnil, Qnil, x_limit, y_limit, Qnil,
-				  Qnil);
+  value = window_text_pixel_size (window, Qnil, Qnil, x_limit, y_limit, Qnil);
 
   unbind_to (count, Qnil);
 
diff --git a/src/xfns.c b/src/xfns.c
index 30ed358fb2..dc25d7bfca 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -7169,8 +7169,7 @@ DEFUN ("x-show-tip", Fx_show_tip, Sx_show_tip, 1, 6, 0,
   try_window (window, pos, TRY_WINDOW_IGNORE_FONTS_CHANGE);
   /* Calculate size of tooltip window.  */
   size = Fwindow_text_pixel_size (window, Qnil, Qnil, Qnil,
-				  make_fixnum (w->pixel_height), Qnil,
-				  Qnil);
+				  make_fixnum (w->pixel_height), Qnil);
   /* Add the frame's internal border to calculated size.  */
   width = XFIXNUM (Fcar (size)) + 2 * FRAME_INTERNAL_BORDER_WIDTH (tip_f);
   height = XFIXNUM (Fcdr (size)) + 2 * FRAME_INTERNAL_BORDER_WIDTH (tip_f);
diff --git a/test/lisp/emacs-lisp/multisession-tests.el b/test/lisp/emacs-lisp/multisession-tests.el
index 1bf0a533a7..981557fd9e 100644
--- a/test/lisp/emacs-lisp/multisession-tests.el
+++ b/test/lisp/emacs-lisp/multisession-tests.el
@@ -26,6 +26,15 @@
 (require 'ert-x)
 (require 'cl-lib)
 
+(defsubst multi-test--on-conflict-p ()
+  "The 'on conflict' is only supported in sqlite3 v3.24.0
+https://stackoverflow.com/a/51531835/5132008"
+  (when (bound-and-true-p multisession--db)
+    (let ((result (with-sqlite-transaction multisession--db
+		    (sqlite-select multisession--db "select sqlite_version()"))))
+      (version-list-<= (version-to-list "3.24.0")
+                       (version-to-list (seq-find #'stringp (cl-first result)))))))
+
 (ert-deftest multi-test-sqlite-simple ()
   (skip-unless (sqlite-available-p))
   (ert-with-temp-file dir
@@ -38,6 +47,7 @@ multi-test-sqlite-simple
             (define-multisession-variable multisession--foo 0
               ""
               :synchronized t)
+            (skip-unless (multi-test--on-conflict-p))
             (should (= (multisession-value multisession--foo) 0))
             (cl-incf (multisession-value multisession--foo))
             (should (= (multisession-value multisession--foo) 1))
@@ -56,11 +66,12 @@ multi-test-sqlite-simple
                               :synchronized t)
                             (cl-incf (multisession-value multisession--foo))))))
             (should (= (multisession-value multisession--foo) 2)))
-        (sqlite-close multisession--db)
+        (when multisession--db
+          (sqlite-close multisession--db))
         (setq multisession--db nil)))))
 
 (ert-deftest multi-test-sqlite-busy ()
-  (skip-unless (and t (sqlite-available-p)))
+  (skip-unless (sqlite-available-p))
   (ert-with-temp-file dir
     :directory t
     (let ((user-init-file "/tmp/foo.el")
@@ -72,6 +83,7 @@ multi-test-sqlite-busy
             (define-multisession-variable multisession--bar 0
               ""
               :synchronized t)
+            (skip-unless (multi-test--on-conflict-p))
             (should (= (multisession-value multisession--bar) 0))
             (cl-incf (multisession-value multisession--bar))
             (should (= (multisession-value multisession--bar) 1))
@@ -93,45 +105,53 @@ multi-test-sqlite-busy
                                     (cl-incf (multisession-value multisession--bar))))))))
             (while (process-live-p proc)
               (ignore-error 'sqlite-locked-error
-                (message "multisession--bar %s" (multisession-value multisession--bar))
-                ;;(cl-incf (multisession-value multisession--bar))
-                )
-              (sleep-for 0.1))
-            (message "multisession--bar ends up as %s" (multisession-value multisession--bar))
+                (message "multisession--bar %s" (multisession-value multisession--bar)))
+              (accept-process-output nil 0.1))
+            (message "bar ends up as %s" (multisession-value multisession--bar))
             (should (< (multisession-value multisession--bar) 1003)))
-        (sqlite-close multisession--db)
+        (when (process-live-p proc)
+          (kill-process proc))
+        (when multisession--db
+          (sqlite-close multisession--db))
         (setq multisession--db nil)))))
 
 (ert-deftest multi-test-files-simple ()
+  (skip-unless (sqlite-available-p))
   (ert-with-temp-file dir
     :directory t
     (let ((user-init-file "/tmp/sfoo.el")
           (multisession-storage 'files)
           (multisession-directory dir))
-      (define-multisession-variable multisession--sfoo 0
-        ""
-        :synchronized t)
-      (should (= (multisession-value multisession--sfoo) 0))
-      (cl-incf (multisession-value multisession--sfoo))
-      (should (= (multisession-value multisession--sfoo) 1))
-      (call-process
-       (concat invocation-directory invocation-name)
-       nil t nil
-       "-Q" "-batch"
-       "--eval" (prin1-to-string
-                 `(progn
-                    (require 'multisession)
-                    (let ((multisession-directory ,dir)
-                          (multisession-storage 'files)
-                          (user-init-file "/tmp/sfoo.el"))
-                      (define-multisession-variable multisession--sfoo 0
-                        ""
-                        :synchronized t)
-                      (cl-incf (multisession-value multisession--sfoo))))))
-      (should (= (multisession-value multisession--sfoo) 2)))))
+      (unwind-protect
+          (progn
+            (define-multisession-variable multisession--sfoo 0
+              ""
+              :synchronized t)
+            (skip-unless (multi-test--on-conflict-p))
+            (should (= (multisession-value multisession--sfoo) 0))
+            (cl-incf (multisession-value multisession--sfoo))
+            (should (= (multisession-value multisession--sfoo) 1))
+            (call-process
+             (concat invocation-directory invocation-name)
+             nil t nil
+             "-Q" "-batch"
+             "--eval" (prin1-to-string
+                       `(progn
+                          (require 'multisession)
+                          (let ((multisession-directory ,dir)
+                                (multisession-storage 'files)
+                                (user-init-file "/tmp/sfoo.el"))
+                            (define-multisession-variable multisession--sfoo 0
+                              ""
+                              :synchronized t)
+                            (cl-incf (multisession-value multisession--sfoo))))))
+            (should (= (multisession-value multisession--sfoo) 2)))
+        (when multisession--db
+          (sqlite-close multisession--db))
+        (setq multisession--db nil)))))
 
 (ert-deftest multi-test-files-busy ()
-  (skip-unless (and t (sqlite-available-p)))
+  (skip-unless (sqlite-available-p))
   (ert-with-temp-file dir
     :directory t
     (let ((user-init-file "/tmp/foo.el")
@@ -168,6 +188,7 @@ multi-test-files-busy
       (should (< (multisession-value multisession--sbar) 2000)))))
 
 (ert-deftest multi-test-files-some-values ()
+  (skip-unless (sqlite-available-p))
   (ert-with-temp-file dir
     :directory t
     (let ((user-init-file "/tmp/sfoo.el")
diff --git a/test/src/xdisp-tests.el b/test/src/xdisp-tests.el
index ae4aacd9c7..dd99b28320 100644
--- a/test/src/xdisp-tests.el
+++ b/test/src/xdisp-tests.el
@@ -21,6 +21,14 @@
 
 (require 'ert)
 
+(defmacro xdisp-tests--visible-buffer (&rest body)
+  (declare (debug t) (indent 0))
+  `(progn
+     (switch-to-buffer (symbol-name (ert-test-name (ert-running-test))))
+     (progn ,@body)
+     (let (kill-buffer-query-functions)
+       (kill-buffer (symbol-name (ert-test-name (ert-running-test)))))))
+
 (defmacro xdisp-tests--in-minibuffer (&rest body)
   (declare (debug t) (indent 0))
   `(catch 'result
@@ -170,4 +178,62 @@ test-get-display-property
     (should (equal (get-display-property 2 'height) 2.0))
     (should (equal (get-display-property 2 'space-width) 20))))
 
+(ert-deftest xdisp-tests--reconnoiter-image-height ()
+  "C-v on image extending beyond window should not signal
+end-of-buffer."
+  (skip-unless (not noninteractive))
+  (skip-unless (> (window-pixel-height) 300))
+  (xdisp-tests--visible-buffer
+    (dotimes (_ (/ (- (window-pixel-height) 100) (line-pixel-height)))
+      (insert "line" "\n"))
+    (insert-image (create-image (expand-file-name
+                                 "test/data/image/blank-100x200.png"
+                                 source-directory)))
+    (insert "\n")
+    (redisplay)
+    (goto-char (point-min))
+    (scroll-up)
+    (redisplay)))
+
+(ert-deftest xdisp-tests--scroll-down-leaves-cursor-behind ()
+  "When first line contains accented, and therefore taller
+character, e.g., Óscar, scrolling down (moving window-start up)
+has resulted in a no-op."
+  (xdisp-tests--visible-buffer
+    (insert "Óscar" "\n")
+    (dotimes (_ (/ (1+ (window-pixel-height)) (line-pixel-height)))
+      (insert "line" "\n"))
+    (goto-char (point-max))
+    (redisplay)
+    (scroll-down)
+    (redisplay)
+    (should (= (window-start) 1))))
+
+(ert-deftest xdisp-tests--window-text-pixel-size-single-sline ()
+  "Verify `window-text-pixel-size' handles one screen line spanned."
+  (xdisp-tests--visible-buffer
+    (save-excursion
+      (insert "xxxx"))
+    (should (= (* 2 (frame-char-width))
+               (car (window-text-pixel-size
+                     nil (1+ (point-min)) (1- (point-max))))))))
+
+(ert-deftest xdisp-tests--window-text-pixel-size-display-property ()
+  "Verify `window-text-pixel-size' returns dimensions including
+width of display property."
+  (xdisp-tests--visible-buffer
+    (let ((disp-string "ornery"))
+      (save-excursion
+        (insert "xxxx"))
+      (should
+       (= (+ (1- (length disp-string))
+             (car (window-text-pixel-size
+                   nil (line-beginning-position) (line-end-position))))
+	  (progn
+	    (put-text-property (1- (line-end-position))
+                               (line-end-position)
+                               'display disp-string)
+	    (car (window-text-pixel-size
+                  nil (line-beginning-position) (line-end-position)))))))))
+
 ;;; xdisp-tests.el ends here
-- 
2.26.2

[Message part 2 (text/plain, inline)]

In Commercial Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2021-12-19 built on dick
Repository revision: fa52e7eee7a9fe2a4b01ce631370a760d46a5c9e
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Message #10 received at 52676-done <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 52676-done <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Mon, 20 Dec 2021 11:26:32 +0800

dick <dick.r.chiang <at> gmail.com> writes:

> Even if 43c4cc2 did anything (it doesn't), it was obviously the wrong
> way to go about it.

On the contrary, it does.  The pixel-scrolling code works on a line with
a line-prefix because of it.

> +	    (car (window-text-pixel-size
> +                  nil (line-beginning-position) (line-end-position)))))))))

This suggests that it will not work for the usecase that the option was
intended to support, because the position `line-beginning-position'
might not be on the start of the visual line.  Trust me, I tried quite a
few options including precisely this before implementing this option.

Closing.

Message #13 received at 52676-done <at> debbugs.gnu.org (full text, mbox):

From: dick <dick.r.chiang <at> gmail.com>
Cc: 52676-done <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Mon, 20 Dec 2021 00:20:55 -0500

I am sure there was a way to do what you wanted without resorting to
what you did.  Perhaps I've been too harsh on you.  You've gotten a lot
of poor (but earnest) counsel from emacs-devel.

What sucks is the statute of limitations on function signature changes
is short.  Once released, that jank, incomprehensibly specific parameter
"ignore-line-at-end" is here to stay.

(defmacro xdisp-tests--visible-buffer (&rest body)
  (declare (debug t) (indent 0))
  `(progn
     (switch-to-buffer "his-fooness")
     (unwind-protect
         (progn ,@body)
       (let (kill-buffer-query-functions)
         (kill-buffer "his-fooness")))))

(xdisp-tests--visible-buffer
  (cl-flet ((test-it
              (what from to)
              (erase-buffer)
              (save-excursion
                (insert what))
              (let ((dims (window-text-pixel-size nil from to nil nil nil t))
                    (dims* (window-text-pixel-size nil from to)))
                (cl-assert
                 dims
                 (cons (car dims*)
                       (- (cdr dims*)
                          (save-excursion
                            (goto-char to)
                            (if (> (line-end-position) (line-beginning-position))
                                (line-pixel-height)
                              0))))))))
    (let ((text "foo\nbar"))
      (test-it text 1 (1+ (length text))))
    (let ((text "foo\nbar\n"))
      (test-it text 1 (1+ (length text))))
    (let ((text "foo\nbar\nbaz"))
      (test-it text 1 (1+ (length text))))
    (let ((text "foo\nbar\n"))
      (test-it text 1 (1+ (length "foo\nbar"))))))

Message #16 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Mon, 20 Dec 2021 17:19:43 +0200

> From: dick <dick.r.chiang <at> gmail.com>
> Date: Sun, 19 Dec 2021 21:32:15 -0500
> 
> Even if 43c4cc2 did anything (it doesn't), it was obviously
> the wrong way to go about it.

It's WIP.  It's too early IMNSHO to judge it, because alone it does
very little.

>    start_display (&it, w, startp);
> -  int start_y = it.current_y;
> -  /* It makes no sense to measure dimensions of region of text that
> -     crosses the point where bidi reordering changes scan direction.
> -     By using unidirectional movement here we at least support the use
> -     case of measuring regions of text that have a uniformly R2L
> -     directionality, and regions that begin and end in text of the
> -     same directionality.  */
> -  it.bidi_p = false;

Why was this removed? what's the rationale?  Did you understand the
underlying problem about which the comment hints?

> -  /* If FROM is on a newline, pretend that we start at the beginning
> -     of the next line, because the newline takes no place on display.  */
> -  if (FETCH_BYTE (start) == '\n')
> -    it.current_x = 0;

And why was this removed?

> -  if (!NILP (x_limit))
> -    {
> -      it.last_visible_x = max_x;
> -      /* Actually, we never want move_it_to stop at to_x.  But to make
> -	 sure that move_it_in_display_line_to always moves far enough,
> -	 we set to_x to INT_MAX and specify MOVE_TO_X.  */
> -      move_op |= MOVE_TO_X;
> -      to_x = INT_MAX;
> -    }

And this?

> -  /* We could have a display property at END, in which case asking
> -     move_it_to to stop at END will overshoot and stop at position
> -     after END.  So we try again, stopping before END, and account for
> -     the width of the last buffer position manually.  */
> -  if (IT_CHARPOS (it) > end)
> -    {
> -      end--;
> -      RESTORE_IT (&it, &it2, it2data);
> -      x = move_it_to (&it, end, to_x, max_y, -1, move_op);
> -      /* Add the width of the thing at TO, but only if we didn't
> -	 overshoot it; if we did, it is already accounted for.  Also,
> -	 account for the height of the thing at TO.  */

And this?

So basically, you removed code which was there to handle real
problems, with no explanations and with log messages whose content
includes no useful information.  The Git history should have pointed
you to the bug reports and discussions which caused us to add those
code fragments you removed, with recipes to create those problematic
situation; did you try those recipes? did you find them not
reproducible, or thought that the fixes are no longer needed, or have
better ideas for how to fix them?  If so, how about including all that
information in your patch submissions?

Without all this information, how can you expect us to use your
patches?  All I see is that you delete code that is there for a
reason.

Message #19 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Mon, 20 Dec 2021 19:11:45 +0200

> From: dick <dick.r.chiang <at> gmail.com>
> Date: Mon, 20 Dec 2021 00:20:55 -0500
> Cc: 52676-done <at> debbugs.gnu.org
> 
> (defmacro xdisp-tests--visible-buffer (&rest body)
>   (declare (debug t) (indent 0))
>   `(progn
>      (switch-to-buffer "his-fooness")
>      (unwind-protect
>          (progn ,@body)
>        (let (kill-buffer-query-functions)
>          (kill-buffer "his-fooness")))))
> 
> (xdisp-tests--visible-buffer
>   (cl-flet ((test-it
>               (what from to)
>               (erase-buffer)
>               (save-excursion
>                 (insert what))
>               (let ((dims (window-text-pixel-size nil from to nil nil nil t))
>                     (dims* (window-text-pixel-size nil from to)))
>                 (cl-assert
>                  dims
>                  (cons (car dims*)
>                        (- (cdr dims*)
>                           (save-excursion
>                             (goto-char to)
>                             (if (> (line-end-position) (line-beginning-position))
>                                 (line-pixel-height)
>                               0))))))))
>     (let ((text "foo\nbar"))
>       (test-it text 1 (1+ (length text))))
>     (let ((text "foo\nbar\n"))
>       (test-it text 1 (1+ (length text))))
>     (let ((text "foo\nbar\nbaz"))
>       (test-it text 1 (1+ (length text))))
>     (let ((text "foo\nbar\n"))
>       (test-it text 1 (1+ (length "foo\nbar"))))))

This produces no assertions here (with the current master), if that's
what you wanted to hear.

Message #22 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 52676 <at> debbugs.gnu.org, 52676-done <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 09:34:37 +0800

dick <dick.r.chiang <at> gmail.com> writes:

> I am sure there was a way to do what you wanted without resorting to
> what you did.  Perhaps I've been too harsh on you.  You've gotten a lot
> of poor (but earnest) counsel from emacs-devel.

None of the counsel was "poor".  If you have anything real to add to the
discussion, please quit the rhetoric and say what the problem is out
loud.

>                  (cons (car dims*)
>                        (- (cdr dims*)
>                           (save-excursion
>                             (goto-char to)
>                             (if (> (line-end-position) (line-beginning-position))
>                                 (line-pixel-height)
>                               0))))))))

There goes the part of the performance problem that change was supposed
to solve: if you take a look at `pixel-point-and-height-at-unseen-line'
in its current slow state, that is similar to what is already being done
there.  (And once again, your test simply does not work when there is a
line-prefix, unlike `pixel-point-and-height-at-unseen-line'.)

So before you come to the conclusion that it is ok to remove a change,
please take a minute to at least try to understand the logic behind that
change.

Message #28 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: dick <dick.r.chiang <at> gmail.com>, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 09:36:40 +0800

Eli Zaretskii <eliz <at> gnu.org> writes:

> This produces no assertions here (with the current master), if that's
> what you wanted to hear.

It fails (for example) when there is a line-prefix, and that code is
slow.

Message #31 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: dick.r.chiang <at> gmail.com, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 05:30:29 +0200

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: dick <dick.r.chiang <at> gmail.com>,  52676 <at> debbugs.gnu.org
> Date: Tue, 21 Dec 2021 09:36:40 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > This produces no assertions here (with the current master), if that's
> > what you wanted to hear.
> 
> It fails (for example) when there is a line-prefix, and that code is
> slow.

Can you show a recipe?

Message #34 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: dick.r.chiang <at> gmail.com, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 11:38:42 +0800

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Po Lu <luangruo <at> yahoo.com>
>> Cc: dick <dick.r.chiang <at> gmail.com>,  52676 <at> debbugs.gnu.org
>> Date: Tue, 21 Dec 2021 09:36:40 +0800
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> > This produces no assertions here (with the current master), if that's
>> > what you wanted to hear.
>> 
>> It fails (for example) when there is a line-prefix, and that code is
>> slow.
>
> Can you show a recipe?

I didn't write one, but that's precisely the code we had in
pixel-point-and-height-at-unseen-line at some point, and it didn't work
with overlays with a before-string, line-prefix and wrap-prefix.

Message #37 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: dick.r.chiang <at> gmail.com, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 14:12:26 +0200

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: dick.r.chiang <at> gmail.com,  52676 <at> debbugs.gnu.org
> Date: Tue, 21 Dec 2021 11:38:42 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Po Lu <luangruo <at> yahoo.com>
> >> Cc: dick <dick.r.chiang <at> gmail.com>,  52676 <at> debbugs.gnu.org
> >> Date: Tue, 21 Dec 2021 09:36:40 +0800
> >> 
> >> Eli Zaretskii <eliz <at> gnu.org> writes:
> >> 
> >> > This produces no assertions here (with the current master), if that's
> >> > what you wanted to hear.
> >> 
> >> It fails (for example) when there is a line-prefix, and that code is
> >> slow.
> >
> > Can you show a recipe?
> 
> I didn't write one, but that's precisely the code we had in
> pixel-point-and-height-at-unseen-line at some point, and it didn't work
> with overlays with a before-string, line-prefix and wrap-prefix.

Well, if you or someone else could produce a "emacs -Q" recipe, I'd be
interested to take a look.

Message #40 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: dick.r.chiang <at> gmail.com, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 20:19:48 +0800

Eli Zaretskii <eliz <at> gnu.org> writes:

> Well, if you or someone else could produce a "emacs -Q" recipe, I'd be
> interested to take a look.

There's no need for you to take a look, because the code in
`window-text-pixel-size' behaves correctly.

dickmao is saying that his code is the equivalent to calling
`window-text-pixel-size' with `ignore-line-at-end' set to t, which is
not true in the presence of a line-prefix or an overlay with a
before-string, which are both use cases that pixel-scroll-precision has
to handle.

Thanks.

Message #43 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: dick <dick.r.chiang <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 12:56:14 -0500

Your transposition of "up" and "down" in pixel-scroll-precision
contradicts the existing understanding of those two directions.

Minimally you could have kept pixel-scroll-precision in a separate
module to avoid conflating the original `pixel-scroll.el`.  Even better,
you might have quarantined it in ELPA.

You remind me Chong Yidong, another spaghetti coder who was inexplicably
given free reign over the code base, and proceeded to spray the master
with indecipherable crudities still being unwound today.

Message #46 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: dick <dick.r.chiang <at> gmail.com>
Cc: Po Lu <luangruo <at> yahoo.com>, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 19:05:51 +0100

>>>>> On Tue, 21 Dec 2021 12:56:14 -0500, dick <dick.r.chiang <at> gmail.com> said:

<drivel deleted>

Eli, Lars, how close are we to banning this individual from the emacs
mailing lists? Because that would have my full support.

Robert
-- 

Message #49 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dick <dick.r.chiang <at> gmail.com>
Cc: luangruo <at> yahoo.com, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Tue, 21 Dec 2021 20:06:40 +0200

> From: dick <dick.r.chiang <at> gmail.com>
> Date: Tue, 21 Dec 2021 12:56:14 -0500
> Cc: 52676 <at> debbugs.gnu.org
> 
> Your transposition of "up" and "down" in pixel-scroll-precision
> contradicts the existing understanding of those two directions.

Which existing understanding is that? where does it exist?

And what do you presume is being scrolled "up": the text or the
window? should C-v be regarded as scrolling "up" or "down"? should
PageDown be bound to scroll-down-command or scroll-up-command?

> Minimally you could have kept pixel-scroll-precision in a separate
> module to avoid conflating the original `pixel-scroll.el`.  Even better,
> you might have quarantined it in ELPA.

Thank you for your valuable advice regarding file and package
organization in Emacs, but we have other ideas, so no, thanks.

> You remind me Chong Yidong, another spaghetti coder who was inexplicably
> given free reign over the code base, and proceeded to spray the master
> with indecipherable crudities still being unwound today.

Hogwash.

Message #52 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Wed, 22 Dec 2021 08:58:56 +0800

dick <dick.r.chiang <at> gmail.com> writes:

> Your transposition of "up" and "down" in pixel-scroll-precision
> contradicts the existing understanding of those two directions.

Those directions are for scrolling based on text lines.  In applications
that scroll based on pixel lines, those two directions are correct.

This was an intentional choice that I explained several times already.

Message #55 received at 52676 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: dick <dick.r.chiang <at> gmail.com>, 52676 <at> debbugs.gnu.org
Subject: Re: bug#52676: 28.0.50; [PATCH] Rationalize window-text-pixel-size
Date: Wed, 22 Dec 2021 08:59:27 +0800

Robert Pluim <rpluim <at> gmail.com> writes:

> Eli, Lars, how close are we to banning this individual from the emacs
> mailing lists? Because that would have my full support.

+1

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