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Miguel Angel Simon Sierra
ed8bf475d3
Rework the timeline row model from one-row-per-stacking-layer to NLE "lanes": a row holds a time-sequence of non-overlapping clips, ordered top = front. Stacking only matters between clips that overlap in time. - Lane packing: per stacking context, sort clips by effective z-index desc (DOM order tiebreak) and greedily pack each onto the first lane whose members don't overlap it in time; else open a new lane. Lane's representative z is the max member z. Audio stays one clip per lane. - Lane-aware drag: dropping onto a lane joins it (clip takes the lane's z) when there's no time-conflict; a conflicting drop is rejected and the preview snaps to the nearest valid lane or a new-lane insertion. Between/above/below still create a new lane at that stacking level. - Overlap checks use the drag-preview start/duration, so conflict is judged by where the clip lands, not where it started. Only explicit drags write z-index; authored z is preserved and data-track-index is never rewritten.