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Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 5.12.4, 5.13.1, 5.14.0 Alpha
Affects Version/s: 5.6.1
Component/s: GUI: Font handling, GUI: Look'n'Feel
Labels:
None
Environment:
(K)Ubuntu 16.04 LTS, xcb, KDE 5.18

Commits:
6afdbfdaafcc4d24e08357dfea96b85787efb1f7 (qt/qtbase/5.12), bf8167c5f (dev), 82cc779ee (6.7)

QFontDatabase::systemFont(QFontDatabase::FixedFont) returns proportional font returns:

Font( "Sans Serif,9,-1,2,50,0,0,0,0,0" )

See screenshot obtained with https://codereview.qt-project.org/#/c/164634/

See QKdeThemePrivate::refresh() at
qtbase/src/platformsupport/themes/genericunix/qgenericunixthemes.cpp:305 ; it sets the QFont::TypeWriter hint on the default font unless one is set. Apparently, this is not sufficient.

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qtbug54623.jpg
07 Jul '16 14:08
152 kB
Friedemann Kleint
qtbug54623_kde5settings.jpg
08 Jul '16 08:15
24 kB
Friedemann Kleint

is duplicated by

QTBUG-54847 FontDatabase returns serif when asking for fixed font

Closed

relates to

QTBUG-103484 rich text gets converted to monospace in CI because QFontDatabase::GeneralFont is "Sans Serif" and is monospace

Reported

QTBUG-121410 tst_QFontDatabase::systemFixedFont() failed on Wayland

Closed

QTBUG-987 QFontInfo::fixedPitch() can report false value

Closed

QTBUG-75587 wasm doesn't have a mono font available

Closed

QTBUG-75648 WinRT: QFontDatabase::systemFont(QFontDatabase::FixedFont) returns proportional font

Closed

QTBUG-75649 Boot2Qt (QEMU): QFontDatabase::systemFont(QFontDatabase::FixedFont) returns proportional font

Closed

QTBUG-79900 QFontDatabase::systemFont(QFontDatabase::FixedFont) returns proportional font

Closed

resulted in

QTBUG-99676 markdown (and html) import/export should not rely on use of a fixed-pitched font to remember a `monospace` span

Closed

(3 relates to, 1 resulted in)

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For Gerrit Dashboard: QTBUG-54623
#	Subject	Branch	Project	Status	CR	V
164686,2	QKdeTheme: Use default monospace font	5.6	qt/qtbase	Status: ABANDONED	0	0
260070,2	QTextMarkdownImporter: try harder to find a mono font	dev	qt/qtbase	Status: ABANDONED	0	0
260075,7	Use "monospace" as fallback system FixedFont in KDE theme; logging	5.12	qt/qtbase	Status: MERGED	+2	0
260945,2	Use "monospace" as fallback system FixedFont in KDE theme; logging	dev	qt/qtbase	Status: MERGED	-2	0
537424,8	tst_QTextMarkdownWriter: test both ways of setting font characteristics	dev	qt/qtbase	Status: MERGED	+2	0
540203,2	tst_QTextMarkdownWriter: test both ways of setting font characteristics	6.7	qt/qtbase	Status: MERGED	+2	0