Subject: bug#24585: 25.1; avoid hack in ggtags.el to run compilation-auto-jump timer

From: Leo Liu <[email-masked]>
Date: Sun, 09 Oct 2016 02:10:00 +0800

On 2016-10-07 14:10 -0400, Stefan Monnier wrote:
> Hmm... calling compilation--ensure-parse *should* help.
> More specifically, if you call compilation--ensure-parse up to point-max
> from compilation-finish-functions, I can't think of any reason why
> compilation-error-properties should be called afterwards.  If you can
> get a backtrace of when that happens, it would help.
>
> E.g. set a buffer-local var from compilation-finish-functions after
> calling compilation--ensure-parse, and then add an assert in
> compilation-error-properties to check that that var is not set yes.

To the best of my knowledge that seems to work with change like this to
compile.el:

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index f2e397a4..3a4f4b8b 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -1052,13 +1052,18 @@ POS and RES.")
 	      l2
 	    (setcdr l1 (cons (list ,key) l2)))))))
 
-(defun compilation-auto-jump (buffer pos)
-  (with-current-buffer buffer
-    (goto-char pos)
-    (let ((win (get-buffer-window buffer 0)))
-      (if win (set-window-point win pos)))
-    (if compilation-auto-jump-to-first-error
-	(compile-goto-error))))
+(defvar-local compilation-pending-auto-jump nil)
+
+(defun compilation-auto-jump (buffer)
+  (when (buffer-live-p buffer)
+    (with-current-buffer buffer
+      (when compilation-pending-auto-jump
+        (goto-char compilation-pending-auto-jump)
+        (let ((win (get-buffer-window buffer 0)))
+          (if win (set-window-point win compilation-pending-auto-jump)))
+        (setq compilation-pending-auto-jump nil)
+        (if compilation-auto-jump-to-first-error
+            (compile-goto-error))))))
 
 ;; This function is the central driver, called when font-locking to gather
 ;; all information needed to later jump to corresponding source code.
@@ -1126,8 +1131,8 @@ POS and RES.")
     (when (and compilation-auto-jump-to-next
                (>= type compilation-skip-threshold))
       (kill-local-variable 'compilation-auto-jump-to-next)
-      (run-with-timer 0 nil 'compilation-auto-jump
-                      (current-buffer) (match-beginning 0)))
+      (setq compilation-pending-auto-jump (match-beginning 0))
+      (run-with-timer 0 nil 'compilation-auto-jump (current-buffer)))
 
     (compilation-internal-error-properties
      file line end-line col end-col type fmt)))