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LibGUI: Process pending invalidations when handling paint events

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It's possible that pending invalidation rectangles haven't been
flushed when processing a paint event. Handle them right away,
which avoids another round trip.
This commit is contained in:
Tom 2021-02-15 19:58:19 -07:00 • committed by Andreas Kling
parent 35170715bc
commit 3907bacfcd
1 changed files with 6 additions and 0 deletions
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6
Userland/Libraries/LibGUI/Window.cpp
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@ -374,6 +374,12 @@ void Window::handle_multi_paint_event(MultiPaintEvent& event)
if (!m_main_widget)
return;
auto rects = event.rects();
if (!m_pending_paint_event_rects.is_empty()) {
// It's possible that there had been some calls to update() that
// haven't been flushed. We can handle these right now, avoiding
// another round trip.
rects.append(move(m_pending_paint_event_rects));
}
VERIFY(!rects.is_empty());
if (m_back_store && m_back_store->size() != event.window_size()) {
// Eagerly discard the backing store if we learn from this paint event that it needs to be bigger.