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bug#40714: Reinitialising the major mode disables which-function-mode.
From: |
Alan Mackenzie |
Subject: |
bug#40714: Reinitialising the major mode disables which-function-mode. |
Date: |
Sun, 19 Apr 2020 11:12:33 +0000 |
Hello, Emacs.
In a typical buffer, say an emacs-lisp-mode buffer, with
which-function-mode enabled and working, do
M-x emacs-lisp-mode
. which-function-mode is no longer working.
#########################################################################
The cause of this is that the enablement of w-f-m is stored in a buffer
local variable which-func-mode. This local variable gets killed on
reinitialising the major mode. There is nothing to set it to non-nil
again.
When visiting a file, which-func-mode gets set in a file-find-hook
function called which-func-ff-hook.
Suggested fix: Move which-func-ff-hook to after-change-major-mode-hook
(renaming it, of course).
--
Alan Mackenzie (Nuremberg, Germany).
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