GNU bug report logs - #43966
Isearch, C-g and f10 interact to leave Isearch in an inconsistent state.

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From: Juri Linkov <juri <at> linkov.net>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Alan Mackenzie <acm <at> muc.de>, 43966 <at> debbugs.gnu.org
Subject: bug#43966: Isearch, C-g and f10 interact to leave Isearch in an inconsistent state.
Date: Wed, 27 Jan 2021 11:27:14 +0200

[Message part 1 (text/plain, inline)]

>>> However, point can be freely moved by, e.g., C-f or C-b., without
>>> terminating the Isearch.  This is a bug.
>>
>> This is because 'isearch-menu-bar-commands' contains 'menu-bar-open'
>> added in bug#32990 to allow invocation of isearch commands from menu.
>
> bug#32990 was a very long thread, so I didn't read that -- but does this
> mean that the reported behaviour isn't a bug?

It's still a bug.  The problem is that when the menu-bar is disabled,
menu-bar-open calls tmm-menubar directly, but in isearch-mode
isearch-tmm-menubar should be used instead.  isearch-mode-map remaps
tmm-menubar to isearch-tmm-menubar, but this doesn't help
in case of menu-bar-open calling tmm-menubar directly.

I see no way to fix this other than handling isearch-mode in tmm-menubar:

[isearch-tmm-menubar.patch (text/x-diff, inline)]

diff --git a/lisp/isearch.el b/lisp/isearch.el
index a86678572c..a1e3fe2c3f 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -513,7 +513,7 @@ isearch-tmm-menubar
     (call-interactively command)))
 
 (defvar isearch-menu-bar-commands
-  '(isearch-tmm-menubar menu-bar-open mouse-minor-mode-menu)
+  '(isearch-tmm-menubar tmm-menubar menu-bar-open mouse-minor-mode-menu)
   "List of commands that can open a menu during Isearch.")
 
 (defvar isearch-menu-bar-yank-map
@@ -787,7 +787,6 @@ isearch-mode-map
 
     (define-key map [menu-bar search-menu]
       (list 'menu-item "Isearch" isearch-menu-bar-map))
-    (define-key map [remap tmm-menubar] 'isearch-tmm-menubar)
 
     map)
   "Keymap for `isearch-mode'.")
diff --git a/lisp/tmm.el b/lisp/tmm.el
index e49246a5c4..2040f52270 100644
--- a/lisp/tmm.el
+++ b/lisp/tmm.el
@@ -56,12 +56,14 @@ tmm-menubar
 `tty-menu-open-use-tmm' to a non-nil value."
   (interactive)
   (run-hooks 'menu-bar-update-hook)
-  (let ((menu-bar (menu-bar-keymap))
-        (menu-bar-item-cons (and x-position
-                                 (menu-bar-item-at-x x-position))))
-    (tmm-prompt menu-bar
-                nil
-                (and menu-bar-item-cons (car menu-bar-item-cons)))))
+  (if isearch-mode
+      (isearch-tmm-menubar)
+    (let ((menu-bar (menu-bar-keymap))
+          (menu-bar-item-cons (and x-position
+                                   (menu-bar-item-at-x x-position))))
+      (tmm-prompt menu-bar
+                  nil
+                  (and menu-bar-item-cons (car menu-bar-item-cons))))))
 
 ;;;###autoload
 (defun tmm-menubar-mouse (event)

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