Two causes, both outside the panel animation itself.
bodyBottom and bodyEndPadding are animated reals, so their sum spends the tail
of every transition on a fraction. A layout rounds that up, then drops a pixel
the moment the animation lands on its exact value — a 1px hop after the motion
has visibly finished. implicitHeight and targetHeight now round.
The rest was the surface. Hyprland animates layer-surface resizes (animations
enabled, `layers` left at its default), and the deferred shrink put that resize
exactly where the panel motion ended. The bar is now sized once to the expanded
rail via the new BarPanel.expandedHeight and never resizes; only exclusiveZone
tracks the state, so the desktop still reflows once per toggle, at the start.
That retires barHeight, the content-height handler and the 340ms shrink timer.
A surface that stays tall would swallow clicks across the screen while the rail
is collapsed, so input is masked to the panel row.
Instrumenting BarPanel per frame ruled the panels themselves out first: slug
and summary hold the same absolute y through an entire collapse.
The bar and scrim also get their own layer namespaces. Nothing depends on them
yet; they are the handle for a layerrule that would exempt the rail from
compositor animations without catching the launchers, which share the default
"quickshell" namespace and do want their fade.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HEtXvseVb5gwAtKNhFx2PU
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