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Revisions: Avoid comparison timeouts for very long lines (66095) - #14540
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Avoid revision comparison timeouts caused by word-level diffs of very long lines. When either matched line exceeds 10,000 bytes, retain the existing line-level diff with both complete, escaped lines; shorter lines continue to receive word-level highlighting.
Add regression coverage for the length boundary, HTML and multibyte content, split and unified views, mixed line lengths, and comparison and restoration of revisions containing long block content.
Trac ticket: https://core.trac.wordpress.org/ticket/66095
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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.