Do not send redundant selectionchange-events (decouple focus)

third_party/WebKit/Source/core/editing/PendingSelection.cpp

Index: third_party/WebKit/Source/core/editing/PendingSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/PendingSelection.cpp b/third_party/WebKit/Source/core/editing/PendingSelection.cpp
index 1b106656d49673990d8f12016ed2f04fad889264..8ffc8e7fe380de3dcdca49a8453493e0a42ab10c 100644
--- a/third_party/WebKit/Source/core/editing/PendingSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/PendingSelection.cpp
@@ -123,10 +123,11 @@ void PendingSelection::commit(LayoutView& layoutView) {
   // necessarily valid, and the following steps assume a valid selection. See
   // <https://bugs.webkit.org/show_bug.cgi?id=69563> and
   // <rdar://problem/10232866>.
-  const VisibleSelectionInFlatTree& selection =
-      createVisibleSelection(calcVisibleSelection(originalSelection));
+  const SelectionInFlatTree selection = calcVisibleSelection(originalSelection);
+  const VisibleSelectionInFlatTree& visibleSelection =
+      createVisibleSelection(selection);
 
-  if (!selection.isRange()) {
+  if (!visibleSelection.isRange() || !selectionHasFocus(selection)) {
     layoutView.clearSelection();
     return;
   }
@@ -137,11 +138,11 @@ void PendingSelection::commit(LayoutView& layoutView) {
   // If we pass [foo, 3] as the start of the selection, the selection painting
   // code will think that content on the line containing 'foo' is selected
   // and will fill the gap before 'bar'.
-  PositionInFlatTree startPos = selection.start();
+  PositionInFlatTree startPos = visibleSelection.start();
   PositionInFlatTree candidate = mostForwardCaretPosition(startPos);
   if (isVisuallyEquivalentCandidate(candidate))
     startPos = candidate;
-  PositionInFlatTree endPos = selection.end();
+  PositionInFlatTree endPos = visibleSelection.end();
   candidate = mostBackwardCaretPosition(endPos);
   if (isVisuallyEquivalentCandidate(candidate))
     endPos = candidate;
@@ -150,8 +151,8 @@ void PendingSelection::commit(LayoutView& layoutView) {
   // |VisiblePosition| when a selection is deleted because we don't yet notify
   // the |FrameSelection| of text removal.
   if (startPos.isNull() || endPos.isNull() ||
-      selection.visibleStart().deepEquivalent() ==
-          selection.visibleEnd().deepEquivalent())
+      visibleSelection.visibleStart().deepEquivalent() ==
+          visibleSelection.visibleEnd().deepEquivalent())
     return;
   LayoutObject* startLayoutObject = startPos.anchorNode()->layoutObject();
   LayoutObject* endLayoutObject = endPos.anchorNode()->layoutObject();