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DWAA1660andClaude Opus 5.5 76a3e7eefe Masks: addVertex and setVertex fill in missing tangents of a loaded path (#1250)
A path's vertices and its two tangent arrays deserialize independently,
and nothing on load makes them agree. mask.new pads them, but a path
read from a project file may carry fewer tangents than vertices.
mask.addVertex checked its index against the vertices only and then
inserted into both tangent arrays, and mask.setVertex indexed the
tangent arrays after the same check, so either command panicked on
such a path (Vec insert/index out of bounds).

ShapePath::fit_tangents gives both arrays one entry per vertex (missing
tangents become corners, extras are dropped), and edit_path_counted
calls it on the value it edits, so every mask/shape-path vertex command
works on a consistent path. Other keyframes of an animated path were
already padded by apply_count_op when the vertex count changes.

Tests: two regression tests save a project, cut every mask path's
tangent arrays to one entry (static value and keyframes), reopen it
through Project::from_json and run setVertex and addVertex. Both panic
at mask.rs:209 without the fix.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-13 11:04:02 -06:00
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