Package: emacs;
Reported by: Keith David Bershatsky <esq <at> lawlist.com>
Date: Tue, 3 Jun 2014 20:46:02 UTC
Severity: wishlist
Found in version 24.4.50
View this message in rfc822 format
From: Keith David Bershatsky <esq <at> lawlist.com> To: 22873 <at> debbugs.gnu.org,17684 <at> debbugs.gnu.org Cc: eliz <at> gnu.org, johnw <at> gnu.org, mbork <at> mbork.pl, rms <at> gnu.org, akioburns <at> icloud.com Subject: bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs). Date: Mon, 22 Jul 2019 23:01:19 -0700
[Message part 1 (text/plain, inline)]
VERSION: 022.001 [07/22/2019]
CHANGELOG:
- `mc_update_window_erase' no longer sets the `same_p` struct member to `false`,
as this was undoing all of the work that had previously been done to discover
and set `same_p` to `true` in previous loops through the caches of fake cursors.
Although this bug may have been somewhat difficult for the naked eye to see,
the fix will improve the overall performance in some situations by reducing the
need to erase and redraw certain fake cursors.
- Miscellaneous tidying-up of code.
VIDEOS:
w32: https://youtu.be/r3BdJVlsAnQ
ns: https://youtu.be/bc1h8jtbXmw
x11: https://youtu.be/aCIFhD2Xz5s
SCREENSHOTS:
https://www.lawlist.com/images/22873_17684_light_dark_backgrounds.png
SETUP:
Step 1: git clone -b master git://git.sv.gnu.org/emacs.git
Step 2: In the new emacs folder, go back to an Emacs version from 07/14/2019:
git reset --hard ac57c5093829ee09084c562bbbc1c412179be13d
Step 3: From within the new emacs folder created in Step 1, apply the patch:
git apply /path/to/the/patch.diff
Step 4: ./autogen.sh
Step 5: ./configure ... [your custom options]
Step 6: make
Step 7: make install
USAGE:
- For a minimal working example of built-in fake cursors, type: M-x mc-test
;;; TURN ON FAKE CURSORS (buffer position, cursor-type, cursor color):
(setq mc-conf '((1 "hbar" "magenta")
(2 "bar" "purple")
(3 "box" "#00FF00")
(4 "hollow" "#0000FF")
(5 ("hbar" 3) [1.0 0.0 1.0])
(6 ("bar" 3) [0.0 1.0 1.0])
(7 "framed" "OrangeRed"))))
;;; TURN OFF FAKE CURSORS:
(setq mc-conf nil)
- To try out both the crosshairs feature and the visible fill column indicator
feature, type: M-x +-mode
- To try out just the visible fill column indicator feature, type: M-x fc-mode
- To try out built-in fake cursors with Magnar Sveen's multiple-cursors package,
that package must be installed. If the multiple-cursors package is already
installed, then just (require 'crosshairs) and `crosshairs.el` will redefine a
few of the multiple-cursors functions and set up a few keyboard shortcuts.
If the multiple-cursors package by Magnar Sveen is not already installed, then
here are two easy ways to install that package:
Type: M-x mc-install
OR, evaluate the following snippet:
(progn
(require 'package)
(add-to-list 'package-archives '("melpa" . "http://melpa.milkbox.net/packages/") t)
(package-initialize)
(package-refresh-contents)
(package-install 'multiple-cursors)
(mc/built-in-cursors))
TODO:
- When an idle-timer fires and point is at the end of a horizontally scrolled
line in a narrow window, the temporary horizontal scroll is canceled. Create
a minimal working example and file a bug report.
(progn
(defun test ()
(interactive)
(let ((ov (make-overlay (point) (1+ (point)) nil t t)))
(overlay-put ov 'face '(:foreground "red"))))
(global-set-key [f5] 'test)
(split-window-horizontally)
(switch-to-buffer (get-buffer-create "foo"))
(setq bidi-display-reordering nil)
(setq-local auto-hscroll-mode 'current-line)
(dotimes (i 80)
(insert (char-to-string (+ 65 i)))))
- `ns_draw_window_cursor' calls `ns_clip_to_rect', which does _not_ take
`row->clip` into consideration when drawing cursors with `NSRectFill'. When
it comes time to draw glyphs on top of the box/hollow family of cursors,
`row->clip` is taken into consideration by `get_glyph_string_clip'. Fake
cursors can be drawn even though the glyphs cannot, resulting in hollow/box
family of cursors without text. The issue can be reproduced with M-x mc-test.
[A temporary workaround is to disable `row->clip` while drawing the glyphs.]
https://lists.gnu.org/archive/html/emacs-devel/2019-04/msg00009.html
- Deal with left/right overwritten glyphs in the w32 and X ports of Emacs.
- There is a bug affecting the recorded `w->mc.lnum_pixel_width` that is
observable when not running under gdb, but disappears when running under gdb.
While viewing a folded org-mode buffer, the non-gdb instance had a visible
line number pixel-width of 44, but Emacs treated it as fluctuating between
44 and 55 as the cursor was moved to the end of line. In the gdb instance,
the visible line number pixel width was 55 with no fluctuation under the same
conditions as the non-gdb instance. This appears to be a different bug than
bug#32177 (current line number shifts one column to the left) because the line
number of the current line does not shift left, and changing the bidi settings
did not correct the issue.
- The current test for `auto_hscroll_mode_p' only looks for `current_line` and
all five related tests are based upon that assumption, which may not be true.
- Multiple Cursors: If point is in the middle of a composite character, then
select a fully composed character so that the fake cursor is visible.
- Implement functionality similar to the Lisp multiple-cursors by Magnar Sveen.
- Follow up with the Emacs team re bug#32177; i.e., (Current line number shifts
one column to the left.)
- Follow up with the Emacs team re bug#32060; i.e., Horizontal Scrolling
(Current Line): Wrong line gets h-scrolled.
- Determine if bug #28936 needs to be fixed and help the Emacs team re same.
- Is there any additional meaningful optimization that can be added to the
three calls of `mc_pre_scroll_clean'?
- There is a bug affecting an older version of Emacs for the NS port that causes
partial line flickering when the same characters are grouped together (;;;;;;)
and MC_GLYPHLESS cursors are above or below -- having the same background color
as the frame; e.g., black on black (used to erase a glyphless cursor). The
partial flickering is only noticeable with rapid fire; e.g., holding down the
right/left arrow key. When changing the color of the glyphless cursor, the
issue is not present. [@lawlist has verified that the X and HPOS coordinates
are accurate.]
- NOTE: As to `mc_scrolling_window', it would appear that there is no tangible
benefit to rotating the current/prospective cache of fake cursors to compare
the data before removing the fake cursors. When scrolling the display, only
_some_ lines are copied to new locations. Areas that are not overwritten may
have fake cursors and those may not necessarily be removed if desired/current
matrix glyphs are equal. The test for `GLYPH_EQUAL_P' does not take into
consideration the existence of a fake cursor, and the glyph (with a fake
cursor) may not be updated as a result thereof. As to lines that are not
copied, portions may be updated and fake cursors would be removed thereby.
[2019_07_22__21_18_46_990.diff (application/diff, attachment)]
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