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UIManager: avoid painting widgets covered by a full screen widget #3770
Navigating the TOC, viewing a full screen image, browsing reading stats... would call paintTo() on ReaderUI (so, asking the engine to render the page) or FileManager (so, rendering cover images) even though their content is hidden.
This makes these things snappier.
I've been testing this only for a few minutes, and haven't seen side effects.
I managed to see FileManager (not being painted thanks to this) while in ReaderUI: when you