Created attachment 87252 [details] Comparison of label colour. Currently the plasma theme uses the same text colour for pressed buttons and "normal" labels. We could increase the contrast of labels of pressed buttons by using a lighter colour. I made a mockup to show the difference in contrast. The light text colour is a bit blurry because of inkscape.
Created attachment 87253 [details] How it could look if implemented
KColorGroup doesn't have a color for pressed buttons (and shouldn't) this may get implemented if a plasma theme can provide custom qml files for painting controls
Definitely would be a nice thing to have and without it potentially we could get into an unreadable text situation. Confirming so it's on our TODO list.
This was fixed recently!