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The bug report came from the Declarative UI project as part of Kinetic.
In FxFlickable the mouse is explicitly grabbed inside the mouse press
event handler, and it's (explicitly) released in the release handler.
When doing this, lastMouseGrabber is 0, and the double-click is delivered
as a press. The fix is to not convert the double-click to a press if the
receiver is the first and only mouse grabber (i.e., lastMouseGrabber is
0).
The fix isn't entirely correct, as it can in theory allow an item to
receive a double-click event as the first received event. This seems
to only be possible in the case of using explicit mouse grabbing in
combinations with the press and release event handlers so it's quite
a corner case.
Reviewed-by: Alexis
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For a QGraphicsWidget w, a shortcut with Qt::WidgetWithChildren context would
trigger even if w did not have focus (provided no other widgets in the view
had focus).
Reviewed-by: andreas
Task-number: 250119
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Change fd4d94df4eb16e9e54f61dd8ee45914e24832ae9 introduced mouse grab
and keyboard grab support to Graphics View (this was as part of 4.4).
The change was missing a large set of autotests that I wrote to test
the behavior of these features. As part of task 245317, which involves
investigating modality in Graphics View, I figured it would be a good
idea to start off but reconstructing these autotests. So this change
is mainly about adding autotests for mouse grabbing. And of course,
as it always is, I found two bugs while writing these tests.
1) Calling QGraphicsItem::grabMouse() while the item is holding the
implicit mouse grab will now upgrade the implicit grab to an
explicit grab.
2) Adding a popup to the scene will automatically grab the mouse.
Before, the popup would get the grab on show(), but if it was
already visible when added to the scene it would not gain the
grab.
Task-number: 245317
Reviewed-by: jasplin
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Do not send a QFontChange event before the item has been polished. This
is because we cannot call a virtual function while we're in the ctor.
This is basically the same as how we do it in QWidget.
Task-number: 246215
Reviewed-by: alexis
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