workaround for wrong calls of childMouseEventFilter ( Qt < 5.10 )

src/controls/QskControl.cpp

@@ -1541,6 +1541,33 @@ bool QskControl::event( QEvent* event )
 
 bool QskControl::childMouseEventFilter( QQuickItem* item, QEvent* event )
 {
+#if QT_VERSION < QT_VERSION_CHECK( 5, 10, 0 )
+
+    if ( event->type() == QEvent::MouseButtonPress )
+    {
+        auto me = static_cast< const QMouseEvent* >( event );
+
+        if ( me->source() == Qt::MouseEventSynthesizedByQt )
+        {
+            /*
+                Unhandled touch events result in creating synthetic
+                mouse events. For all versions < 5.10 those events are
+                passed through childMouseEventFilter without doing the
+                extra checks, that are done for real mouse events.
+                To avoid having a different behavior between using
+                mouse and touch, we do those checks here.
+             */
+            if ( !( item->acceptedMouseButtons() & me->button() ) )
+                return false;
+
+            const auto pos = item->mapFromScene( me->windowPos() );
+            if ( !item->contains( pos ) )
+                return false;
+        }
+    }
+
+#endif
+
     return d_func()->maybeGesture( item, event );
 }