1 files changed, 10 insertions, 3 deletions
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index c616e91..d9e0eec 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -902,11 +902,18 @@ void QGraphicsScenePrivate::grabMouse(QGraphicsItem *item, bool implicit)
 {
     // Append to list of mouse grabber items, and send a mouse grab event.
     if (mouseGrabberItems.contains(item)) {
-        if (mouseGrabberItems.last() == item)
-            qWarning("QGraphicsItem::grabMouse: already a mouse grabber");
-        else
+        if (mouseGrabberItems.last() == item) {
+            Q_ASSERT(!implicit);
+            if (!lastMouseGrabberItemHasImplicitMouseGrab) {
+                qWarning("QGraphicsItem::grabMouse: already a mouse grabber");
+            } else {
+                // Upgrade to an explicit mouse grab
+                lastMouseGrabberItemHasImplicitMouseGrab = false;
+            }
+        } else {
             qWarning("QGraphicsItem::grabMouse: already blocked by mouse grabber: %p",
                      mouseGrabberItems.last());
+        }
         return;
     }