RubyLB: Support breaking in HandleOverflow()

* The intrinsic inline-size of a ruby column fits in the available space of the current line, * There is no soft break opportunity at the end of the ruby column, and * The following text exceeds the available space. If the above conditions met, the entire ruby column was rewound though it has soft break opportunities. This CL supports breaking at the last soft break opportunity inside the ruby column. Bug: 324111880 Change-Id: Ia40ba37d552fae8f411834a7a1288a285cff9202 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5569799 Commit-Queue: Koji Ishii <[email protected]> Auto-Submit: Kent Tamura <[email protected]> Reviewed-by: Koji Ishii <[email protected]> Cr-Commit-Position: refs/heads/main@{#1306306}
web-platform-tests · May 27, 2024 · dba739b · dba739b
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diff --git a/css/css-ruby/break-within-bases/no-break-opportunity-at-end-ref.html b/css/css-ruby/break-within-bases/no-break-opportunity-at-end-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<style>
+div {
+  font-size: 20px;
+}
+</style>
+
+<body lang="ja">
+<div>
+ここは<ruby>優先通行<rt>ゆうせんつうこう</ruby><br><ruby>帯<rt>たい</ruby>。
+</div>
+</body>
diff --git a/css/css-ruby/break-within-bases/no-break-opportunity-at-end.html b/css/css-ruby/break-within-bases/no-break-opportunity-at-end.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-ruby/#break-within">
+<link rel="match" href="no-break-opportunity-at-end-ref.html">
+<style>
+div {
+  width: 160px;
+  font-size: 20px;
+}
+</style>
+
+<body lang="ja">
+
+<!-- The ruby fits in the first line, but we can not break
+     the line at its end because of the following "。". -->
+<div>
+ここは<ruby>優先通行帯<rt>ゆうせんつうこうたい</ruby>。
+</div>
+</body>