* bug#28599: 26.0.50; font-lock-ensure changes the face of text buttons
@ 2017-09-25 19:47 Alexander Miller
2019-10-30 18:48 ` Lars Ingebrigtsen
0 siblings, 1 reply; 2+ messages in thread
From: Alexander Miller @ 2017-09-25 19:47 UTC (permalink / raw)
To: 28599
Steps to reproduce:
* emacs -q
* switch to a text-mode buffer
* Run (insert-text-button "AAAAAAAAAAA" 'face 'font-lock-constant-face)
* Run (font-lock-ensure)
The button's face will now have changed from font-lock-constant to button.
This only happens once, a second call to font-lock-ensure makes no such
changes.
Overlay buttons don't seem to be affected.
I also tested this on a self-compiled emacs 25.2.1, with the same result.
In GNU Emacs 26.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.19)
of 2017-09-15 built on a-laptop
Repository revision: 6e38b9253e3d67def0e16f90da574b4622d962a3
Windowing system distributor 'The X.Org Foundation
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#28599: 26.0.50; font-lock-ensure changes the face of text buttons
2017-09-25 19:47 bug#28599: 26.0.50; font-lock-ensure changes the face of text buttons Alexander Miller
@ 2019-10-30 18:48 ` Lars Ingebrigtsen
0 siblings, 0 replies; 2+ messages in thread
From: Lars Ingebrigtsen @ 2019-10-30 18:48 UTC (permalink / raw)
To: Alexander Miller; +Cc: 28599
Alexander Miller <alexanderm@web.de> writes:
> Steps to reproduce:
>
> * emacs -q
> * switch to a text-mode buffer
> * Run (insert-text-button "AAAAAAAAAAA" 'face 'font-lock-constant-face)
> * Run (font-lock-ensure)
>
> The button's face will now have changed from font-lock-constant to button.
> This only happens once, a second call to font-lock-ensure makes no such
> changes.
> Overlay buttons don't seem to be affected.
>
> I also tested this on a self-compiled emacs 25.2.1, with the same result.
I'm unable to reproduce this exactly -- when I try this in Emacs 27, the
face property is just cleared, and no new face is applied. And it
happens on all calls to font-lock-ensure.
This happens because that function calls,
font-lock-default-fontify-region, which calls
font-lock-default-unfontify-region is called, and it just does
(defun font-lock-default-unfontify-region (beg end)
"Unfontify the text between BEG and END.
This function is the default `font-lock-unfontify-region-function'."
(remove-list-of-text-properties
beg end (append
font-lock-extra-managed-props
(if font-lock-syntactic-keywords
'(syntax-table face font-lock-multiline)
'(face font-lock-multiline)))))
So if you want to have both your own faces and use font-lock, too, you
have to use font-lock-face instead of face, according to "Precalculated
Fontification".
So there doesn't seem to be a bug here.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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2017-09-25 19:47 bug#28599: 26.0.50; font-lock-ensure changes the face of text buttons Alexander Miller
2019-10-30 18:48 ` Lars Ingebrigtsen
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