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Lift the snackbar above a toolbar placed at the bottom

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SealShare's only navigation is a floating toolbar at place="bottom". In
1.x it set --material-bottom-bar to lift the snackbar over it; in 2.0.0
the toolbar reads that variable to place itself, so an application can
no longer set it, and the snackbar landed on the toolbar. M3 nudges a
snackbar "upward to avoid overlapping FABs/docked toolbars" and never
puts one in front of navigation.

A bottom-placed toolbar now publishes --material-bottom-toolbar, the
distance from the window's bottom edge to its top: floating 64px (as
tall as an md or lg FAB beside it), docked 64px plus the safe area it
pads, rounded docked floating from 840px. It is declared on :root and
again on the scaffold's root, the only place its formula sees the bar.
The snackbar clears whichever of the bar and the toolbar reaches higher,
and a page pads its end with it. Two Chromium tests, both failing on the
old formula: a docked toolbar on a scaffold's navigation bar, and a
floating toolbar without a scaffold (plan step 46).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Andreas Reinhold / reini
2026-09-15 10:47:50 +02:00
co-authored by Claude Opus 5
parent 579af9e7a9
commit d0bed0da69
9 changed files with 124 additions and 9 deletions
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UPGRADE.md
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@@ -100,7 +100,10 @@ over a colour, use the role directly.
- `<x-section-nav>` with five or more sections is a scrollable tab bar, not a grid. The tab bar is
10px taller; the focus ring sits outside.
- The navigation bar's horizontal label is `label-md`; `place="bottom"` toolbars sit above
`--material-bottom-bar`; a standard toolbar's icon buttons are `primary`.
`--material-bottom-bar`; a standard toolbar's icon buttons are `primary`. An application that
set `--material-bottom-bar` to lift the snackbar over its own bottom toolbar removes it: the
toolbar now reads it to place itself, and publishes `--material-bottom-toolbar`, which the
snackbar clears and the page pads its end with.
- The centred app bar headline is a grid column; the `search` variant bounds its own width, so
drop hand-written `max-w-*` wrappers.
- `<x-app-shell>` is renamed `<x-scaffold>`, with no alias; it is a column with a nested row