I can now recreate this on my mac, by the following sequence ....
1.launch Sigil
2. click on green button to go full screen
3. move mouse to title bar and hit the green button again to exit full screen
4. Sigil starts to return to normal but grows to become maximized and can not be resized.
5. Even using option+green button to leave maximized state fails.
I will try to trackdown what on earth Qt is doing.
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