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Try to fix bug #10989.

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The problem is that popping dialogs during reload can cause paint
events for which we are not ready. If this does not work, then we
can introduce a new flag, besides 'busy', for that case. But busy
does not seem to be used very widely, so hopefully this works.

Note that when paintEvent is triggered on macOS, the least we can do
is to copy our backing store to the screen.

(cherry picked from commit 19e6977b5b)
(cherry picked from commit d03deeca0c)
This commit is contained in:
Richard Kimberly Heck 2018-04-25 23:46:13 -04:00 committed by Jean-Marc Lasgouttes
parent 00ec2dd106
commit 8abea3b7e9
1 changed files with 10 additions and 0 deletions
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10
src/frontends/qt4/GuiWorkArea.cpp
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@ -1244,6 +1244,16 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
void GuiWorkArea::paintEvent(QPaintEvent * ev)
{
// Do not trigger the painting machinery if we are not ready (see
// bug #10989). However, since macOS has turned the screen black at
// this point, our backing store has to be copied to screen.
if (view().busy()) {
// this is a no-op except on macOS.
d->updateScreen(ev->rect());
ev->accept();
return;
}
// LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
// << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());