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bug#33798: 27.0.50; font-lock-ensure fontifies the whole buffer
From: |
Juri Linkov |
Subject: |
bug#33798: 27.0.50; font-lock-ensure fontifies the whole buffer |
Date: |
Wed, 19 Dec 2018 00:15:12 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu) |
X-Debbugs-CC: Stefan Monnier <monnier@iro.umontreal.ca>
The simplest test case to reproduce this is to eval in emacs -Q:
(with-temp-buffer
(insert "#include <stdio.h>\n\nmain()\n{\n printf(\"Hello, world\");\n}")
(c-mode)
(font-lock-ensure 21 (point-max))
(get-text-property (point-min) 'face))
that returns
=> font-lock-preprocessor-face
This means that `font-lock-ensure' fontifies not only the given region,
but also the whole buffer.
OTOH,
(with-temp-buffer
(insert "#include <stdio.h>\n\nmain()\n{\n printf(\"Hello, world\");\n}")
(c-mode)
(font-lock-fontify-region 21 (point-max))
(get-text-property (point-min) 'face))
returns `nil' that means that it fontifies only within the specified boundary.
This difference is essential for bug#33567: Syntactic fontification of diff
hunks
where fontifying the whole buffer might slow down fontification of diff hunks
that are small parts of the whole buffer.
- bug#33798: 27.0.50; font-lock-ensure fontifies the whole buffer,
Juri Linkov <=