- restrict preference reads to the lol-user-experience section;
- distinguish a failed close-preference read from a missing key;
- reject xprop's 'not found' text as a WM_CLASS value;
- track a window before unmap so an interrupting signal still restores it;
- report the tricks-mode opt-out in the hide helper's startup message;
- cover the new cases with preference, window and interruption tests.