feat(studio): the automation lane itself - #3024
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Draws each automated parameter as its own lane under the audio clip, on the same disclosure caret the keyframe lanes use — that caret is the DAW automation triangle. One lane per parameter rather than a selector to swap between them, so two envelopes can be read and edited without hiding either. Double-click the line to add a point, drag to shape it, right-click a point to remove it. Three things here took more than one attempt, and the comments say why: - **A dragged point did not move.** The live write deliberately skips the preview refresh — that is what keeps dragging from restarting playback — so the stored value does not move under the pointer. The lane keeps a local draft. - **Releasing snapped it back.** The draft was dropped when the drag ended, which is before the persisted write comes around; it now lives until the automation it was drawn over actually changes. - **A press was eaten.** Not stopping propagation let the timeline start its own gesture and swallow the second half of a double-click. The lane owns the press once it is live — and when it is not, it selects its clip instead, since lanes sit below the clip bar where the timeline's own selection handler never sees them. The envelope is inset by the grab radius so a point at the clip's first or last frame is drawn whole rather than half outside the lane, and clip time still lines up with screen position because the inset and the offset cancel. 🤖 Generated with [Claude Code](https://claude.com/claude-code)
The lane was mounted inside the property-lanes wrapper, which renders only for a track's GSAP keyframe clip — so an audio clip with no tween resolved to nothing: no disclosure caret, no reserved height, no lanes. Verified on a composition with one `<audio>`, an envelope, and no tweens anywhere: 0 carets, 0 lanes. The attribute still wrote and the render still baked it, so the feature failed silently for exactly the tracks it exists for. Same composition now: 1 caret, and expanding it draws the Volume lane. Automation counts as something to disclose. `resolveTrackKeyframeClip` takes a counter alongside the keyframe lane counts and qualifies a clip on either; the header asks the same counter about the clip it already holds. A function rather than another map threaded through the props: every caller then reads one cached parse, so the height a row reserves and the lanes drawn in it cannot drift apart. That drift is also fixed for the lane's own offset, which passed the raw tween count where every other consumer uses distinct property groups. Two tweens on one property drew one keyframe lane but pushed the automation lane down by two, spilling into the next track; one tween on two properties did the inverse and drew it over a diamond lane, stealing its pointer events. It now reads the same `laneCounts` map the reserved height and the drawn lanes use. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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