Travelling pieces were painted into an overlay above the entire tree —
Compose's default, and right for a thumbnail flying across a screen, wrong
for a grid changing shape in place. Everything tagged left the tree's
z-order, so every untagged neighbour spent the transition buried under it.
Lifting each of those out in turn — the selection outline, then both "+N"
markers — fixed the burying and bought something worse: they floated over
the grid on a layer of their own, out of step with what they belong to.
Three pieces needing the same escape hatch was the tell that the overlay
itself was wrong here.
Nothing renders in the overlay now. One z-order, one clip, so the grid
reads as a single surface changing shape rather than a stack of pieces
sliding past each other. The outline goes back to being plain content that
sits above its own pill the ordinary way, and morphOverlay is gone.
The "+N" markers become a matched pair instead of an orphan. The compact
grid writes the count as text and the expanded one as a row of dots, but
they stand for the same events on exactly the same days — both seat three
and overflow the rest — so they were always two halves of one marker.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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