A slip on a layer with no source handles succeeded with `delta: 0` and nothing else, which
read like a no-op bug. The result now carries `requested` (seconds) and, per layer, `clamped`
when the source could not move that far.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Text strokes were always drawn with round joins. The document gets a
Line Join (`lineJoin: miter|round|bevel` in layer.setText / newText),
Miter for new text as in After Effects, Round for documents saved before
it so their look is kept. The 2D and Advanced 3D (extruded) text strokes
use it, expressions' style copies carry it, and the Character panel has
Miter / Round / Bevel buttons under the stroke width.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Opening the editor keeps the keyframe and mask-vertex selection as well as the property one,
and Duplicate cleared only the properties. With the copy selected, Clear then deleted a key or
vertex of the original instead of the copy. During an edit the copies now take the selection the
way a click on them does: layer.select's rule, moved into one helper both use. With no edit
open, Duplicate's selection is unchanged.
