Windows: Fix tooltip flicker on GL surfaces

QPlatformWindow::initialGeometry() would assign a default height to
the initial geometry of the QRollEffectClassWindow since it has height
of 0. This causes the obtained geometry to not match and subsequently
a geometry change being sent synchronously.

Introduce a new flag QWindowPrivate::resizeAutomatic similar to the
existing QWindowPrivate::positionAutomatic to prevent assigning a
default size and pass through the geometry as is where required.

Fixes: QTBUG-74176
Change-Id: I70c66490838a2c4dfe200ec86094d28bd984dd03
Reviewed-by: Kati Kankaanpaa <kati.kankaanpaa@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 2abd1eef8b..0376e363f3 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1132,7 +1132,8 @@ QWindowCreationContext::QWindowCreationContext(const QWindow *w,
     // TODO: No concept of WA_wasMoved yet that would indicate a
     // CW_USEDEFAULT unless set. For now, assume that 0,0 means 'default'
     // for toplevels.
-    if (geometry.isValid()) {
+    if (geometry.isValid()
+        || !qt_window_private(const_cast<QWindow *>(w))->resizeAutomatic) {
         frameX = geometry.x();
         frameY = geometry.y();
         const QMargins effectiveMargins = margins + customMargins;