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Theming / Font configuration: "bold" inherited unexpectedly (lemmy.sdf.org)

submitted 3 days ago by [email protected] to c/[email protected]

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I've been trying to style my Qt apps since I discovered the old Motif-look Style Plugin still exists; maybe I can have software not made in 1994 that looks like it was!

In the process, I noticed an odd behaviour.

I set up QT_QPA_PLATFORMTHEME=qt5ct so I could use qt5ct to do the basic configuration.

If I set the "general" font as bold, and the "fixed width" value as non-bold, when I reload qt5ct, it's switched to bold. This can also be seen in other Qt programs.

If I manually force the issue by editing qt5ct.conf, manually setting up a block like this, the bold fixed-width font still shows

[Fonts]

fixed="Go Mono,11,-1,5,75,0,0,0,0,0,Regular"

general="Helvetica,11,-1,5,75,0,0,0,0,0,Bold"

I thought this might be some weirdness due to the specific fonts I chose, but swapping in "Liberation Sans" and "Courier 10 Pitch" produce the same situation.

The only way I can have my fixed-width font be "regular" is to also leave the general font as "regular". This is not a connection I expected.

Is this a known issue? Is there a workaround?

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[–] [email protected] 1 points 1 day ago* (last edited 1 day ago)

Followup in the spirit of documenting it for someone else: If you modify the fonts in qt5ct.conf, removing the last option, for some reason it does exactly what I want: looking at notepadqq, I get a bold menu, but non-bold body text.

[Fonts]

fixed="Go Mono,11,-1,5,50,1,0,0,0,0,0"

general="Helvetica,11,-1,5,75,0,0,0,0,0"

It seems like removing the last paramater treats the specification as less prescriptive-- places in the UI that call for bold get it, and non-bold gets it. This is evident in the Double Commander Qt package, where some parts of the UI are bold and others aren't.