QWindowsGuiEventDispatcher: Register timers in constructor.

Port change 3716a76704273fdbe5ad4ec978438daeda606c26 (Qt 4)
to Qt 5. Enforce the creation of the internal window
and registering of timers in the event dispatcher constructor
for GUI applications instead of delaying it to processEvents()
is called. Move the call to virtual wakeUp() out of
createInternalHwnd().

Task-number: QTBUG-40881
Change-Id: I82a4748897da140a39feff882c75ad5ac6155148
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/src/corelib/kernel/qeventdispatcher_win.cpp b/src/corelib/kernel/qeventdispatcher_win.cpp
index 7816edd3f9..a3d00faf31 100644
--- a/src/corelib/kernel/qeventdispatcher_win.cpp
+++ b/src/corelib/kernel/qeventdispatcher_win.cpp
@@ -639,7 +639,6 @@ void QEventDispatcherWin32::createInternalHwnd()
 {
     Q_D(QEventDispatcherWin32);
 
-    Q_ASSERT(!d->internalHwnd);
     if (d->internalHwnd)
         return;
     d->internalHwnd = qt_create_internal_window(this);
@@ -664,9 +663,6 @@ void QEventDispatcherWin32::createInternalHwnd()
     // start all normal timers
     for (int i = 0; i < d->timerVec.count(); ++i)
         d->registerTimer(d->timerVec.at(i));
-
-    // trigger a call to sendPostedEvents()
-    wakeUp();
 }
 
 QEventDispatcherWin32::QEventDispatcherWin32(QObject *parent)
@@ -686,8 +682,10 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
 {
     Q_D(QEventDispatcherWin32);
 
-    if (!d->internalHwnd)
+    if (!d->internalHwnd) {
         createInternalHwnd();
+        wakeUp(); // trigger a call to sendPostedEvents()
+    }
 
     d->interrupt = false;
     emit awake();