[webkit-changes] [WebKit/WebKit] 80993f: Avoid traversing the FrameTree up in FrameTree::top()

[Ahmad Saleem]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 80993fda030b571a3937b08f8809b50d72b61855
      https://github.com/WebKit/WebKit/commit/80993fda030b571a3937b08f8809b50d72b61855
  Author: Ahmad Saleem <ahmad.saleem792+github at gmail.com>
  Date:   2024-01-19 (Fri, 19 Jan 2024)

  Changed paths:
    M Source/WebCore/page/FrameTree.cpp

  Log Message:
  -----------
  Avoid traversing the FrameTree up in FrameTree::top()

https://bugs.webkit.org/show_bug.cgi?id=185394

Reviewed by Chris Dumez.

Credits & Patch Authored by Chris Dumez.

Avoid traversing the FrameTree up in FrameTree::top() and rely on Frame::mainFrame() instead to get
the answer right away. There is a potential behavior change if calling FrameTree::top() on a detached
frame (it will keep return the main frame now instead of returning the frame itself). However, it
should not matter in practice as we should not be dealing with the FrameTree of a detached frame.

* Source/WebCore/page/FrameTree.cpp:
(FrameTree::top):

Canonical link: https://commits.webkit.org/273230@main