[webkit-changes] [WebKit/WebKit] 763623: Improve resolving of scrollbar-gutter style

[Luke Warlow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 76362384eea16a54d1b77d63215830abef329124
      https://github.com/WebKit/WebKit/commit/76362384eea16a54d1b77d63215830abef329124
  Author: Luke Warlow <luke at warlow.dev>
  Date:   2023-07-08 (Sat, 08 Jul 2023)

  Changed paths:
    M Source/WebCore/page/LocalFrameView.cpp
    M Source/WebCore/page/LocalFrameView.h
    M Source/WebCore/platform/ScrollableArea.cpp
    M Source/WebCore/platform/ScrollableArea.h
    M Source/WebCore/rendering/RenderLayerScrollableArea.cpp
    M Source/WebCore/rendering/RenderLayerScrollableArea.h

  Log Message:
  -----------
  Improve resolving of scrollbar-gutter style
https://bugs.webkit.org/show_bug.cgi?id=259014

Reviewed by Darin Adler.

Move the resolution of scrollbar-gutter styles to its own function and implement for RenderLayerScrollableArea and LocalFrameView.
This will allow implementation of scrollbar-gutter on viewports.

This patch has no behaviour changes.

* Source/WebCore/page/LocalFrameView.cpp:
(WebCore::LocalFrameView::scrollbarGutterStyle const):
* Source/WebCore/page/LocalFrameView.h:
* Source/WebCore/platform/ScrollableArea.cpp:
(WebCore::ScrollableArea::scrollbarGutterStyle const):
* Source/WebCore/platform/ScrollableArea.h:
* Source/WebCore/rendering/RenderLayerScrollableArea.cpp:
(WebCore::RenderLayerScrollableArea::verticalScrollbarWidth const):
(WebCore::RenderLayerScrollableArea::horizontalScrollbarHeight const):
(WebCore::RenderLayerScrollableArea::scrollbarGutterStyle const):
* Source/WebCore/rendering/RenderLayerScrollableArea.h:

Canonical link: https://commits.webkit.org/265882@main