A full-screen scrim carrying the dense bar's drafting grid, shown while the
rail is expanded and faded out with it.
It sits on the TOP layer while the bar moves to OVERLAY. Both on one layer
would stack by surface creation order, which is not something to rely on; a
layer apart makes "above windows, below the bar" a guarantee. The mask is an
empty Region, so the scrim takes no clicks and reserves nothing.
The grid is the dense bar's, at twice the spacing and with registration
crosses on every other intersection. Its 0.018 opacity was tuned against a
near-black panel and is invisible over a scrim on lit windows, so grid and
crosses are both properties rather than constants, and the lines take a
desaturated accent derived from the palette instead of plain text colour.
Cross geometry rounds with Math.floor on both the mark's offset and the bars
inside it. anchors.*Center halves the box unfloored, which put an even-sized
mark half a pixel off the 1px rule it registers against. crossThickness is in
steps for the same reason: 1 -> 1px, 2 -> 3px, 3 -> 5px, since only an odd
width straddles a rule symmetrically.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HEtXvseVb5gwAtKNhFx2PU
darmanandClaude Opus 5
7eb7b948e8