Bug 1153694 - Don't let nsDisplayFixedPosition cause unnecessary layerization around itself. r=mattwoodrow

MozReview-Commit-ID: 66q3PkOdvTe
2016-06-02 20:55:02 -04:00
parent 2f543743af
commit 0ecc6c3a60
3 changed files with 45 additions and 0 deletions
--- a/layout/base/FrameLayerBuilder.cpp
+++ b/layout/base/FrameLayerBuilder.cpp
@@ -4005,6 +4005,10 @@ ContainerState::ProcessDisplayItems(nsDisplayList* aList)
        mPaintedLayerDataTree.AddingOwnLayer(animatedGeometryRoot,
                                             clipPtr,
                                             uniformColorPtr);
+      } else if (!clipMovesWithLayer) {
+        mPaintedLayerDataTree.AddingOwnLayer(animatedGeometryRootForClip,
+                                             clipPtr,
+                                             uniformColorPtr);
      } else {
        // Using itemVisibleRect here isn't perfect. itemVisibleRect can be
        // larger or smaller than the potential bounds of item's contents in