Bug 1726261 - Replace GetCrossDocParentFrame in GetNearestScrollableFrameForDirection with GetCrossDocParentFrameInProcess. r=botond

Differential Revision: https://phabricator.services.mozilla.com/D122910

layout/base/nsLayoutUtils.cpp

@@ -1426,7 +1426,10 @@ nsIScrollableFrame* nsLayoutUtils::GetNearestScrollableFrameForDirection(
     nsIFrame* aFrame, ScrollDirections aDirections) {
   NS_ASSERTION(
       aFrame, "GetNearestScrollableFrameForDirection expects a non-null frame");
-  for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
+  // FIXME Bug 1714720 : This nearest scroll target is not going to work over
+  // process boundaries, in such cases we need to hand over in APZ side.
+  for (nsIFrame* f = aFrame; f;
+       f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
     nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
     if (scrollableFrame) {
       ScrollDirections directions =