We should not be sending a WM_MOUSELEAVE to the parent from the...

We should not be sending a WM_MOUSELEAVE to the parent from the LegacyRenderWidgetHostHWND class when the parent has capture.

The LegacyRenderWidgetHostHWND class tracks WM_MOUSEMOVES to inform the parent when the mouse cursor moves outside the
bounds of the parent window. When the parent sets capture, Windows sends us a WM_MOUSELEAVE message. We should be ignoring this.

BUG=343844
R=sky@chromium.org
TBR=cpu

Review URL: https://codereview.chromium.org/166163004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251370 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/legacy_render_widget_host_win.cc

@@ -171,12 +171,14 @@ LRESULT LegacyRenderWidgetHostHWND::OnMouseLeave(UINT message,
                                                  WPARAM w_param,
                                                  LPARAM l_param) {
   mouse_tracking_enabled_ = false;
-  // We should send a WM_MOUSELEAVE to the parent window only if the mouse has
-  // moved outside the bounds of the parent.
-  POINT cursor_pos;
-  ::GetCursorPos(&cursor_pos);
-  if (::WindowFromPoint(cursor_pos) != GetParent())
-    return ::SendMessage(GetParent(), message, w_param, l_param);
+  if (GetCapture() != GetParent()) {
+    // We should send a WM_MOUSELEAVE to the parent window only if the mouse
+    // has moved outside the bounds of the parent.
+    POINT cursor_pos;
+    ::GetCursorPos(&cursor_pos);
+    if (::WindowFromPoint(cursor_pos) != GetParent())
+      return ::SendMessage(GetParent(), message, w_param, l_param);
+  }
   return 0;
 }