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bug#4854: 23.1.50; before-string overlay and show-paren-mode
From: |
npostavs |
Subject: |
bug#4854: 23.1.50; before-string overlay and show-paren-mode |
Date: |
Fri, 01 Jul 2016 14:42:30 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.93 (gnu/linux) |
severity 4854 minor
tags 4854 notabug
quit
A simpler test is
1. emacs -Q
2. eval
(defun show-overlays ()
(interactive)
(message "ovlist %S"
(mapcar (lambda (o)
(cons o (overlay-properties o)))
(overlays-in (1- (point)) (1+ (point))))))
(global-set-key "\C-cs" 'show-overlays)
3. M-x show-paren-mode
4. with point on a parenthesis
C-c s gives
ovlist ((#<overlay from 730 to 731 in *scratch*> face show-paren-match priority
1000))
M-x show-overlays gives
ovlist nil
Stephen Berman <stephen.berman@gmx.net> writes:
> These two things seem very strange: (i) enabling show-paren-mode and
> getting the show-paren overlay somehow nullifies the unless test; (ii)
> this effect only happens when the command is invoked via a key
> sequence.
It's because show-paren-mode uses a single (pair of) overlay(s) for all
buffers and moves it to right place during idle time. When you invoke a
command with M-x the overlay pair gets moved to the minibuffer. With a
direct keybinding the overlay pair stays in the current buffer. This
can be demonstrated by adding this advice (additional to the code
evaluated above):
(defun debug-show-paren-mode (&rest _args)
(message "show-paren-function in buffer %S" (current-buffer)))
(advice-add 'show-paren-function :before #'debug-show-paren-mode)
When using C-c s:
show-paren-function in buffer #<buffer *scratch*> [4 times]
ovlist ((#<overlay from 506 to 507 in *scratch*> face show-paren-match priority
1000))
When using M-x show-overlays:
show-paren-function in buffer #<buffer *Minibuf-1*> [5 times]
ovlist nil
You can run the command ‘show-overlays’ with C-c s
So I think this is not a bug, it's just how show-paren-mode works.
- bug#4854: 23.1.50; before-string overlay and show-paren-mode,
npostavs <=