[webkit-changes] [WebKit/WebKit] 16b100: [IFC][Line clamp] Line clamp may produce empty IFCs

[Alan Baradlay]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 16b10061f0fd7608a1f3d4711e1f937ed1f6a3db
      https://github.com/WebKit/WebKit/commit/16b10061f0fd7608a1f3d4711e1f937ed1f6a3db
  Author: Alan Baradlay <zalan at apple.com>
  Date:   2022-11-21 (Mon, 21 Nov 2022)

  Changed paths:
    M Source/WebCore/layout/formattingContexts/inline/InlineFormattingContext.cpp
    M Source/WebCore/layout/formattingContexts/inline/InlineFormattingGeometry.cpp
    M Source/WebCore/layout/formattingContexts/inline/display/InlineDisplayContentBuilder.cpp
    M Source/WebCore/layout/integration/inline/LayoutIntegrationLineLayout.cpp

  Log Message:
  -----------
  [IFC][Line clamp] Line clamp may produce empty IFCs
https://bugs.webkit.org/show_bug.cgi?id=248158

Reviewed by Antti Koivisto.

When we run out of the visible lines for line-clamp, sibling IFCs start producing empty content.
However BFC cannot not call into IFC because we still need to produce some geometry (albeit not correct) for content with DOM nodes.

* Source/WebCore/layout/formattingContexts/inline/InlineFormattingContext.cpp:
(WebCore::Layout::InlineFormattingContext::lineLayout):
* Source/WebCore/layout/formattingContexts/inline/InlineFormattingGeometry.cpp:
(WebCore::Layout::InlineFormattingGeometry::staticPositionForOutOfFlowInlineLevelBox const):
* Source/WebCore/layout/formattingContexts/inline/display/InlineDisplayContentBuilder.cpp:
(WebCore::Layout::InlineDisplayContentBuilder::computeIsFirstIsLastBoxForInlineContent):
* Source/WebCore/layout/integration/inline/LayoutIntegrationLineLayout.cpp:
(WebCore::LayoutIntegration::LineLayout::constructContent):

Canonical link: https://commits.webkit.org/256905@main