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Fix an issue where the last line of block-based diffs could be incorrectly hidden
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Authored by epriestley on Jan 30 2020, 4:17 PM.
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F19687480: D20959.id49934.diff
Mon, Feb 9, 3:54 PM
F19546219: D20959.id49934.diff
Jan 25 2026, 4:14 AM
F19524736: D20959.id49934.diff
Jan 18 2026, 3:42 AM
F19521753: D20959.id49935.diff
Jan 17 2026, 1:40 AM
F19519086: D20959.id49935.diff
Jan 16 2026, 1:33 AM
F19514374: D20959.id49935.diff
Jan 14 2026, 1:24 AM
F19510454: D20959.diff
Jan 11 2026, 9:47 AM
F19099572: D20959.id.diff
Dec 4 2025, 8:40 PM
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Details

Summary

Fixes T13468. See that task for discussion. The older source-rendering code mixes "line number" / "1-based" lists with "block number" / "0-based" lists and then has other bugs which cancel this out.

For block-based diffs, build an explicit block-based mask with only block numbers. This sort of sidesteps the whole issue.

Test Plan

Viewed the diff with the original reproduction case, plus various other block-based diffs, including one-block image diffs, in unified and side-by-side mode. Didn't spot any oddities.

Diff Detail

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