SceneViewport had grown to 1216 lines. Three blocks carried their own
state and only needed a few things from the view, so they now live in
their own classes. Behaviour is unchanged.
- SceneViewHost is the narrow interface the new classes see of the
view: state, coordinate mapping, redraw and the preview trigger.
- TilemapPainting owns the paint stroke, the rectangle preview and
the flood fill, with press/move/release called in the old order.
- PolygonCorners owns hovering, dragging, inserting and deleting the
corners of a polygon collider.
- TilemapSolids draws the solid outlines of tilemap layers.
- SceneViewport is down to 668 lines.
Findings:
- PaintStroke.holderId was written but never read. It is gone.
Tests:
- ./check.sh: 145 files, 2190 tests, CHECK EXIT 0 (unchanged)
- e2e 1-16,29,31,39-43: ALL PASSED, 679 checks
- Counter-checks in the browser: bending the brush, the corner drag
and the solid outline each fails exactly the expected checks.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
