Bug 160758

Summary:	I think there should be a way to turn off the automatic font changing
Product:	LibreOffice	Reporter:	aer0a137
Component:	Writer	Assignee:	Not Assigned <libreoffice-bugs>
Status:	RESOLVED WONTFIX
Severity:	enhancement	CC:	vsfoote
Priority:	medium
Version:	unspecified
Hardware:	All
OS:	All
Whiteboard:
Crash report or crash signature:		Regression By:

Description aer0a137 2024-04-21 06:32:46 UTC

I think there should be a way to turn off the automatic font changing. For example, when I type certain characters (such as 「 and 」) and the font is set to Fairfax HD with a font size of 12pt, it changes to a NSimSun (at least it would've if I hadn't went into the specific setting and changed the font for the "Asian" character set to Fairfax HD) at a size of 10.5pt because 「 and 」 are part of the "Asian" character set, while the other characters I was using (characters in the UCSUR, which are assigned to private use characters) aren't. This is very annoying, so I think that there should be a way to turn this feature off.

Comment 1 V Stuart Foote 2024-04-21 13:52:46 UTC

Font fall back/substitution is controlled by the os.

Additionally, if you use a font heavy with PUA, the os font fallback will be chaotic. Unicode PUA codepoints are meaningless except when explicitly applied from the font containing them--there is no effective way to control that, locale or language of the glyph or as assigned to word is not sufficient.

Use a charmap utility, like BableMap on Windows, to explore the coverage of the font. LibreOffice's Special Character Dialog also works, but the collapsed character charts are a bit annoying to work with when looking at the PUA glyph coverage, or a fonts actual BMP/SMP glyphs.  Something not in the font gets os controlled fallback.