Fix content-visibility-fieldset-size.html

https://bugs.webkit.org/show_bug.cgi?id=258935

Reviewed by Alan Baradlay.

Fix content-visibility-fieldset-size.html by preventing painting
fieldset contents where content-visibility causes the content to
be skipped.

* LayoutTests/TestExpectations:
* Source/WebCore/rendering/RenderBlock.cpp:
(WebCore::RenderBlock::adjustBorderBoxRectForPainting):
(WebCore::RenderBlock::paintRectToClipOutFromBorder):
(WebCore::RenderBlock::paintExcludedChildrenInBorder):

Canonical link: https://commits.webkit.org/266226@main

LayoutTests/TestExpectations

@@ -4929,7 +4929,6 @@ imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visib
 imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-auto-state-changed.html [ Skip ]
 imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-auto-state-changed-first-observation.html [ Skip ]
 imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-auto-state-changed-removed.html [ Skip ]
-imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-fieldset-size.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-video.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-contain/counter-scoping-001.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-contain/counter-scoping-002.html [ ImageOnlyFailure ]

Source/WebCore/rendering/RenderBlock.cpp

@@ -3356,7 +3356,7 @@ RenderBox* RenderBlock::findFieldsetLegend(FieldsetFindLegendOption option) cons
 
 void RenderBlock::adjustBorderBoxRectForPainting(LayoutRect& paintRect)
 {
-    if (!isFieldset() || !intrinsicBorderForFieldset())
+    if (!isFieldset() || isSkippedContentRoot() || !intrinsicBorderForFieldset())
         return;
 
     auto* legend = findFieldsetLegend();
@@ -3379,7 +3379,7 @@ void RenderBlock::adjustBorderBoxRectForPainting(LayoutRect& paintRect)
 LayoutRect RenderBlock::paintRectToClipOutFromBorder(const LayoutRect& paintRect)
 {
     LayoutRect clipRect;
-    if (!isFieldset())
+    if (!isFieldset() || isSkippedContentRoot())
         return clipRect;
     auto* legend = findFieldsetLegend();
     if (!legend)
@@ -3522,7 +3522,7 @@ LayoutUnit RenderBlock::adjustIntrinsicLogicalHeightForBoxSizing(LayoutUnit heig
 
 void RenderBlock::paintExcludedChildrenInBorder(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    if (!isFieldset())
+    if (!isFieldset() || isSkippedContentRoot())
         return;
 
     RenderBox* box = findFieldsetLegend();