Fonts rendering in titlebars with KDecoration2

[René J.V. Bertin]

Hi,

Trying out kdecoration-viewer confirmed something I already noticed when I ran KWin5 from a parallel prefix, replacing my usual KWin4. The font in the window titlebars is the same, but looks different. I have the Infinality Freetype and FontConfig patches installed, so any form or font rendering that uses some other implementation pops out a bit more saliently (because visibly worse) than compared to a system where those patches aren't used.

All other text rendering examples I've seen from my Qt5 install look as they should, so this really appears to be specific to window titlebars. What's different here?

Cheers,
R.