The patch partially fixes an issue where all logout-related buttons are colored as black.
Current logout screen uses a black background which renders blackish logout-related buttons and icons difficult to read for an user.
This patch changes color of logout-related buttons and texts to white so they can easily be seen in the logout view which uses black as background color. The trick here is use contrary colors which improves the user experience.
This patch does not fix an issue which regards to user icon and user name. In code, they are combined into one element. Currently, if we change color of the element to white, a custom user icon is filled with white as well. If default KDE icon is used, the issue exists but is not so visible because the icon element itself is partially a transparent element and only opaque parts are filled with white. Solution here would be to use user name as a separate element so it can be colored individually, and possibly make some code changes into file "/lookandfeel/contents/components/UserDelegate.qml" where the icon style is defined.
Currently, user name and user icon are not re-colored to white. So this patch is more or less a partial implementation/fix.
Unfinished code is somewhat commented out in the patch file but can be used later on if needed.