Bug 2223938

Summary: Qt 6 render the Bold style CJK character very thick with Noto CJK variable fonts
Product: [Fedora] Fedora Reporter: Lee Dan <DNDLinuxer>
Component: qt6-qtbaseAssignee: Jan Grulich <jgrulich>
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Version: 38CC: jgrulich, kde-sig
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OS: Linux   
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Screenshot of the bold style Chinese text none

Description Lee Dan 2023-07-19 10:30:57 UTC 
Qt 6 has the same variable fonts render problem as fixed in Qt 5 month ago, ref https://bugzilla.redhat.com/show_bug.cgi?id=2179854

Reproducible: Always

Steps to Reproduce:
1.update fedora 38 to latest version to install Noto CJK VF fonts
2.Switch desktop to use Chinese locale or set LANG and LC_ALL to use Chinese locale
3.Install and Launch mediawriter, and the "选择源镜像" text becomes very thick
Actual Results:  
The rendering result is thicker than the normal Noto CJK fonts, and hard to read.

Expected Results:  
The rendering result is the same as the normal Noto CJK fonts.

problem found in telegram-desktop from rpmfusion, and then confirmed in fedora media writer from system.

the patch from 2179854, may be applied to Qt 6 with minor fix, for relative files just moved to src/gui/text and relative logic unmodified.
Comment 1 Lee Dan 2023-07-19 10:33:44 UTC 
Created attachment 1976477 [details]
Screenshot of the bold style Chinese text