Clear the state of scroll and selection onmouseup

third_party/WebKit/Source/core/input/MouseEventManager.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/input/MouseEventManager.h"
 
 #include "core/clipboard/DataObject.h"
 #include "core/clipboard/DataTransfer.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
@@ skipping 487 matching lines @@
       // Use WebFocusTypeForward instead of WebFocusTypeMouse here to mean the
       // focus has slided.
       found->focus(FocusParams(SelectionBehaviorOnFocus::kReset,
                                kWebFocusTypeForward, nullptr));
       return true;
     }
   }
   return false;
 }
 
+void MouseEventManager::HandleMouseReleaseEventUpdateStates() {
+  ClearDragHeuristicState();
+  InvalidateClick();
+  frame_->GetEventHandler().GetSelectionController().SetMouseDownMayStartSelect(
+      false);
+}
+
 void MouseEventManager::HandleMousePressEventUpdateStates(
     const WebMouseEvent& mouse_event) {
   CancelFakeMouseMoveEvent();
   mouse_pressed_ = true;
   captures_dragging_ = true;
   SetLastKnownMousePosition(mouse_event);
   mouse_down_may_start_drag_ = false;
   mouse_down_may_start_autoscroll_ = false;
   mouse_down_timestamp_ =
       TimeTicks::FromSeconds(mouse_event.TimeStampSeconds());
 
   if (FrameView* view = frame_->View()) {
     mouse_down_pos_ = view->RootFrameToContents(
         FlooredIntPoint(mouse_event.PositionInRootFrame()));
   } else {
     InvalidateClick();
   }
+
+  frame_->GetEventHandler().GetSelectionController().SetMouseDownMayStartSelect(
+      false);
 }
 
 bool MouseEventManager::IsMousePositionUnknown() {
   return is_mouse_position_unknown_;
 }
 
 IntPoint MouseEventManager::LastKnownMousePosition() {
   return last_known_mouse_position_;
 }
 
@@ skipping 497 matching lines @@
 
 void MouseEventManager::SetClickCount(int click_count) {
   click_count_ = click_count;
 }
 
 bool MouseEventManager::MouseDownMayStartDrag() {
   return mouse_down_may_start_drag_;
 }
 
 }  // namespace blink