Send leave to most recently entered window when modal dialog is shown.

If a modal dialog was shown as a response to button click, the button
retained its hover highlight, because it didn't get leave event.

Fixed by tracking the most recently entered window and sending a leave
to it when modal dialog is shown that blocks it.

Also modified tst_QGuiApplication::modalWindow() autotest to check
for enters and leaves.

Task-number: QTBUG-27644
Change-Id: I387647e18a762a39d523e3df31221b9583a39f9d
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/widgets/kernel/qwidgetwindow.cpp b/src/widgets/kernel/qwidgetwindow.cpp
index b3d46d5c28..b49441beba 100644
--- a/src/widgets/kernel/qwidgetwindow.cpp
+++ b/src/widgets/kernel/qwidgetwindow.cpp
@@ -234,6 +234,7 @@ void QWidgetWindow::handleEnterLeaveEvent(QEvent *event)
                 while (enterParent->parent())
                     enterParent = enterParent->parent();
                 if (thisParent == enterParent) {
+                    QGuiApplicationPrivate::currentMouseWindow = enterWindow;
                     enter = enterWindow->widget();
                     QWindowSystemInterfacePrivate::removeWindowSystemEvent(systemEvent);
                 }