[webkit-changes] [WebKit/WebKit] 1ac712: Dynamically added custom scrollbar styles don't apply

[Vitaly Dyachkov]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 1ac712cb8d9ba46db5be7a0e9e33511155df750e
      https://github.com/WebKit/WebKit/commit/1ac712cb8d9ba46db5be7a0e9e33511155df750e
  Author: Vitaly Dyachkov <vitaly at igalia.com>
  Date:   2023-06-09 (Fri, 09 Jun 2023)

  Changed paths:
    A LayoutTests/fast/css/scrollbar-custom-dynamic-change-expected.html
    A LayoutTests/fast/css/scrollbar-custom-dynamic-change.html
    M Source/WebCore/style/StyleTreeResolver.cpp

  Log Message:
  -----------
  Dynamically added custom scrollbar styles don't apply
https://bugs.webkit.org/show_bug.cgi?id=211219

Reviewed by Antti Koivisto.

`::-webkit-scrollbar` pseudo-element should be resolved eagerly during
style resolution, similar to `::first-line` and `::first-letter`.

* LayoutTests/fast/css/scrollbar-custom-dynamic-change-expected.html: Added.
* LayoutTests/fast/css/scrollbar-custom-dynamic-change.html: Added.
* Source/WebCore/style/StyleTreeResolver.cpp:
(WebCore::Style::TreeResolver::resolveElement):

Canonical link: https://commits.webkit.org/265015@main