layout: Fix trailing collapsible space handling with <ruby>

* Trailing collapsible space should not be handled in ruby-base lines because such lines are contained by another line. This CL introduces `LineBreaker:: disable_trailing_whitespace_collapsing_`. * ComputeTrailingCollapsibleSpace() should iterate inside ruby columns recursively. * RemoveTrailingCollapsibleSpace() and TrailingCollapsibleSpaceWidth() should compute ruby column widths correctly. * ruby-intra-level-whitespace-001.html passed accidentally. It requires <rb> and table-like pairing. Bug: 376097115 Change-Id: I55e4559012ec08c9b423ad8a518890c02862d857 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5996911 Commit-Queue: Koji Ishii <[email protected]> Auto-Submit: Kent Tamura <[email protected]> Reviewed-by: Koji Ishii <[email protected]> Cr-Commit-Position: refs/heads/main@{#1379515}
web-platform-tests · Nov 7, 2024 · 6ad1d8a · 6ad1d8a
1 parent ad13530
commit 6ad1d8a
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diff --git a/css/css-ruby/collapse-trailing-whitespace-ref.html b/css/css-ruby/collapse-trailing-whitespace-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+p {
+  font: 20px/1 Ahem;
+  width: 12em;
+}
+ruby { color: blue; }
+rt { color: orange; }
+</style>
+
+<p>nihongo |&nbsp;<ruby>n<rt>n</ruby><br><ruby>hon<rt>hon</ruby><ruby>go&nbsp;<rt>go</ruby>|</p>
diff --git a/css/css-ruby/collapse-trailing-whitespace.html b/css/css-ruby/collapse-trailing-whitespace.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://crbug.com/376097115">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="match" href="collapse-trailing-whitespace-ref.html"/>
+<meta name="assert" content="A space after '|' should be preserved,
+    a space after 'n' should be collapsed,
+    and a space after 'go' should be preserved.">
+<style>
+p {
+  font: 20px/1 Ahem;
+  xtext-align: justify;
+  xtext-align-last: justify;
+  width: 12em;
+}
+ruby { color: blue; }
+rt { color: orange; }
+</style>
+
+<p>nihongo | <ruby>n <rt>n</ruby><ruby>hon<rt>hon</ruby><ruby>go <rt>go</ruby>|</p>