5 files changed, 31 insertions, 8 deletions

diff --git a/src/gui/effects/qgraphicseffect.cpp b/src/gui/effects/qgraphicseffect.cpp
index ad23df3..10ef5ea 100644
--- a/src/gui/effects/qgraphicseffect.cpp
+++ b/src/gui/effects/qgraphicseffect.cpp
@@ -383,9 +383,9 @@ void QGraphicsEffectSourcePrivate::invalidateCache(InvalidateReason reason) cons
 {
     if (m_cachedMode != QGraphicsEffect::PadToEffectiveBoundingRect
         && (reason == EffectRectChanged
-            || reason == TransformChanged
-               && m_cachedSystem == Qt::LogicalCoordinates))
+            || (reason == TransformChanged && m_cachedSystem == Qt::LogicalCoordinates))) {
         return;
+    }
 
     QPixmapCache::remove(m_cacheKey);
 }
diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 10d31ea..9773404 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -7253,7 +7253,9 @@ void QGraphicsItem::prepareGeometryChange()
 
         QGraphicsScenePrivate *scenePrivate = d_ptr->scene->d_func();
         scenePrivate->index->prepareBoundingRectChange(this);
-        scenePrivate->markDirty(this, QRectF(), /*invalidateChildren=*/true);
+        scenePrivate->markDirty(this, QRectF(), /*invalidateChildren=*/true, /*force=*/false,
+                                /*ignoreOpacity=*/ false, /*removingItemFromScene=*/ false,
+                                /*updateBoundingRect=*/true);
 
         // For compatibility reasons, we have to update the item's old geometry
         // if someone is connected to the changed signal or the scene has no views.
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index 9219773..54d47fa 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -4832,7 +4832,8 @@ void QGraphicsScenePrivate::draw(QGraphicsItem *item, QPainter *painter, const Q
 }
 
 void QGraphicsScenePrivate::markDirty(QGraphicsItem *item, const QRectF &rect, bool invalidateChildren,
-                                      bool force, bool ignoreOpacity, bool removingItemFromScene)
+                                      bool force, bool ignoreOpacity, bool removingItemFromScene,
+                                      bool updateBoundingRect)
 {
     Q_ASSERT(item);
     if (updateAll)
@@ -4903,7 +4904,8 @@ void QGraphicsScenePrivate::markDirty(QGraphicsItem *item, const QRectF &rect, b
     if (ignoreOpacity)
         item->d_ptr->ignoreOpacity = 1;
 
-    item->d_ptr->markParentDirty();
+    if (!updateBoundingRect)
+        item->d_ptr->markParentDirty();
 }
 
 static inline bool updateHelper(QGraphicsViewPrivate *view, QGraphicsItemPrivate *item,
diff --git a/src/gui/graphicsview/qgraphicsscene_p.h b/src/gui/graphicsview/qgraphicsscene_p.h
index 54d8130..04ffe0f 100644
--- a/src/gui/graphicsview/qgraphicsscene_p.h
+++ b/src/gui/graphicsview/qgraphicsscene_p.h
@@ -222,7 +222,8 @@ public:
               QRegion *, QWidget *, qreal, const QTransform *const, bool, bool);
 
     void markDirty(QGraphicsItem *item, const QRectF &rect = QRectF(), bool invalidateChildren = false,
-                   bool force = false, bool ignoreOpacity = false, bool removingItemFromScene = false);
+                   bool force = false, bool ignoreOpacity = false, bool removingItemFromScene = false,
+                   bool updateBoundingRect = false);
     void processDirtyItemsRecursive(QGraphicsItem *item, bool dirtyAncestorContainsChildren = false,
                                     qreal parentOpacity = qreal(1.0));
 
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 48e43b2..2a60708 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -4419,8 +4419,17 @@ void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font,
     bool auto_swap = autoBufferSwap();
 
     QPaintEngine::Type oldEngineType = qgl_engine_selector()->preferredPaintEngine();
-    qgl_engine_selector()->setPreferredPaintEngine(QPaintEngine::OpenGL);
+
     QPaintEngine *engine = paintEngine();
+    if (engine && (oldEngineType == QPaintEngine::OpenGL2) && engine->isActive()) {
+        qWarning("QGLWidget::renderText(): Calling renderText() while a GL 2 paint engine is"
+                 " active on the same device is not allowed.");
+        return;
+    }
+
+    // this changes what paintEngine() returns
+    qgl_engine_selector()->setPreferredPaintEngine(QPaintEngine::OpenGL);
+    engine = paintEngine();
     QPainter *p;
     bool reuse_painter = false;
     if (engine->isActive()) {
@@ -4513,8 +4522,17 @@ void QGLWidget::renderText(double x, double y, double z, const QString &str, con
     win_y = height - win_y; // y is inverted
 
     QPaintEngine::Type oldEngineType = qgl_engine_selector()->preferredPaintEngine();
-    qgl_engine_selector()->setPreferredPaintEngine(QPaintEngine::OpenGL);
     QPaintEngine *engine = paintEngine();
+
+    if (engine && (oldEngineType == QPaintEngine::OpenGL2) && engine->isActive()) {
+        qWarning("QGLWidget::renderText(): Calling renderText() while a GL 2 paint engine is"
+                 " active on the same device is not allowed.");
+        return;
+    }
+
+    // this changes what paintEngine() returns
+    qgl_engine_selector()->setPreferredPaintEngine(QPaintEngine::OpenGL);
+    engine = paintEngine();
     QPainter *p;
     bool reuse_painter = false;
     bool use_depth_testing = glIsEnabled(GL_DEPTH_TEST);