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I'll begin with my understanding of the intended window levels from the windowDidResignKey and windowDidBecomeKey functions:
- Fullscreen non keyWindow =
NSNormalWindowLevel
- Fullscreen keyWindow =
NSStatusWindowLevel
Our application listens to FL_SCREEN_CONFIGURATION_CHANGED to be able to handle when a new monitor has been added while the window is in fullscreen. When this happens we need to call FLTK's fullscreen_x() to enable fullscreen on the new monitor as well. The function needs to be called while the window already is in fullscreen.
It's possible that this happens when the fullscreen window isn't keyWindow, and in this case the proper level seems to be NSNormalWindowLevel instead of NSStatusWindowLevel.
We also want to avoid re-stacking windows within the same level, this happens when setting level to the same value again. The window who's level was re-set will appear in front. This was already mentioned in a comment in fixup_window_levels().
Lastly, when the level of a window changes we should make sure the stacking is correct for modal and non-modal windows, this is done using fixup_window_levels() on other places in the code, we should do the same in fullscreen_x().
You can view, comment on, or merge this pull request online at:
https://github.com/fltk/fltk/pull/277
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