The Layers panel cut a name that didn't fit with an ellipsis and had no horizontal scrollbar, so
an imported component set's variants all read "Size=small, Type=prim..." and a deeply nested name
lost its room to the indent. The row cache now also keeps the width the widest row needs (a few
names measured per rebuild, picked by a bound on their width), the list takes that width and
scrolls both ways, revealing a layer scrolls up or down only, and a name past 1200 pt still
elides (#1650).
Tests: layers_wide_names_tests. Docs: ui-parity Layers panel row, status line and revision
history.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>