thandClaude Opus 4.7
f29dc448fb
Buttons used to ignore `isMask` on every render path — the mask shape drew as normal content instead of clipping the button's other layers. Every entry point now routes button children through `drawMaskedGroup`: - `drawLayers` nested-button branch - new `drawButtonFrame` (used by the mask-preview overlay in button-edit mode so the preview reflects the button's own stage instead of the main scene) - `renderButtonThumbnail` so sidebar previews match the stage - exported-runtime button branch mirrors the split; bumped `RUNTIME_VERSION` to '11' so cached players reload Also: - Timeline clip-track dropzone hides until the library has at least one clip, and the hint stays centred in the visible ruler area instead of drifting with horizontal scroll. - Regression tests pin positive/negative button masks in `drawButtonFrame` and verify `drawSceneFrame` applies button-internal masks when the button sits on the main stage. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>