Version: (using KDE 4.2.0) Installed from: Ubuntu Packages It seems that many KDE4 apps, for example dolphin and akregator, use improper icon size for window decoration and taskbar. It seems that they're using 48x48 no matter what, which results with ugly, fuzzy scaled icons on taskbar/window decoration instead of crispy, non-scaled 22x22 (or 16x16). Guys from KWin said it's not their fault and from what I can teel it's true, because I just found out that system settings handle his icon very well (crispy 22x22 on window decoration and proper icon on taskbar (depends on taskbar height)).
http://standards.freedesktop.org/wm-spec/wm-spec-latest.html#id2552223 "This specification does not stipulate what size these icons should be, but individual desktop environments or toolkits may do so. The Window Manager MAY scale any of these icons to an appropriate size." No specification; no fix. *** This bug has been marked as a duplicate of bug 182191 ***
Previous comment is incorrect. Applications provide a list of icon sizes. It appears that Qt4 sets only one icon size.
Reported to Qt (issue #242866).