https://bugs.kde.org/show_bug.cgi?id=474790

--- Comment #7 from david <[email protected]> ---
Created attachment 196819
  --> https://bugs.kde.org/attachment.cgi?id=196819&action=edit
se98 konsole original vs titlebar app icon

Turns out the icon size depends on font size. Here are the sizes, using Breeze
kwin decoration with Button size: Medium, using Noto Sans font.

Font size     | Icon size (px)
4pt           | 8x8
5pt           | 12x12
6pt - 8pt     | 16x16 (good)
9pt - 11pt    | 20x20
12pt - 13pt   | 24x24 (good)
14pt - 15pt   | 28x28
16pt          | 32x32 (good)

It would be nice if it preferred icon theme's sizes instead (so 16x16, ...). Or
if it was possible to set a fixed size for the icon.

> Thanks. I can't reproduce it with current git master, but I also have a 4K 
> screen at 200% scale, so blurry icons look less prominent for me. Still they 
> don't look blurry at all.

Here's the easiest way to reproduce:
1. Set scaling to 100%
2. Use SE98 icon theme
3. Use Noto Sans 10pt for Window title font
4. Zoom in (using KDE's accessibility feature, disable "Sharpen screen content
while zoomed in", pixel grid should be shown, if it's not then set it to
something low like 3)
5. Compare app icon in the titlebar with the actual icon file. Most clearly
visible with Konsole (the pixelated "C:\" is sharp in original file, blurry in
the titlebar) 

Operating System: Bazzite 44
KDE Plasma Version: 6.7.5
KDE Frameworks Version: 6.30.0
Qt Version: 6.11.2
Graphics Platform: Wayland

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