2 files changed, 7 insertions, 3 deletions
diff --git a/src/gui/effects/qgraphicseffect.cpp b/src/gui/effects/qgraphicseffect.cpp
index e25b40b..f20480b 100644
--- a/src/gui/effects/qgraphicseffect.cpp
+++ b/src/gui/effects/qgraphicseffect.cpp
@@ -350,8 +350,10 @@ void QGraphicsEffect::setEnabled(bool enable)
         return;
 
     d->isEnabled = enable;
-    if (d->source)
+    if (d->source) {
         d->source->d_func()->effectBoundingRectChanged();
+        d->source->d_func()->invalidateCache();
+    }
     emit enabledChanged(enable);
 }
 
@@ -405,8 +407,10 @@ QGraphicsEffectSource *QGraphicsEffect::source() const
 void QGraphicsEffect::updateBoundingRect()
 {
     Q_D(QGraphicsEffect);
-    if (d->source)
+    if (d->source) {
         d->source->d_func()->effectBoundingRectChanged();
+        d->source->d_func()->invalidateCache();
+    }
 }
 
 /*!
diff --git a/src/gui/effects/qgraphicseffect_p.h b/src/gui/effects/qgraphicseffect_p.h
index 87abbbc..24d8696 100644
--- a/src/gui/effects/qgraphicseffect_p.h
+++ b/src/gui/effects/qgraphicseffect_p.h
@@ -102,8 +102,8 @@ public:
         QGraphicsEffect::ChangeFlags flags;
         if (source) {
             flags |= QGraphicsEffect::SourceDetached;
-            source->d_func()->detach();
             source->d_func()->invalidateCache();
+            source->d_func()->detach();
             delete source;
         }
         source = newSource;