Make mouse drag to ignore unfocused selection

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

Index: third_party/WebKit/Source/core/editing/SelectionController.cpp
diff --git a/third_party/WebKit/Source/core/editing/SelectionController.cpp b/third_party/WebKit/Source/core/editing/SelectionController.cpp
index 444584d6264a490b8b8483f2cafcc927abd3bc46..89f86731d3aaf003d5e9eb34faa355a18c0d09de 100644
--- a/third_party/WebKit/Source/core/editing/SelectionController.cpp
+++ b/third_party/WebKit/Source/core/editing/SelectionController.cpp
@@ -353,9 +353,11 @@ void SelectionController::UpdateSelectionForMouseDrag(
   frame_->GetDocument()->UpdateStyleAndLayoutIgnorePendingStylesheets();
 
   const PositionWithAffinity& raw_target_position =
-      PositionRespectingEditingBoundary(
-          Selection().ComputeVisibleSelectionInDOMTree().Start(),
-          hit_test_result.LocalPoint(), target);
+      Selection().SelectionHasFocus()
+          ? PositionRespectingEditingBoundary(
+                Selection().ComputeVisibleSelectionInDOMTree().Start(),
+                hit_test_result.LocalPoint(), target)
+          : PositionWithAffinity();
   VisiblePositionInFlatTree target_position = CreateVisiblePosition(
       FromPositionInDOMTree<EditingInFlatTreeStrategy>(raw_target_position));
   // Don't modify the selection if we're not on a node.