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feat(web): draw the sidebar's scrollbar only under the pointer

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The session list overflows after a handful of sessions, and its scrollbar
was drawn permanently in a column that is at rest most of the time.

SidebarRoot now tracks the pointer over the whole column and rebinds
ui-theme's scrollbar indirection pair to `transparent` while it is
outside, keeping the thumb for 2s after the pointer leaves so it does not
blink out on the way past. Rebinding colour leaves the list's
`scrollbar-gutter: stable` reservation in force, so revealing the bar
moves no row.

ui-theme's gate now states the widened contract: a rebind targets an -l2
token pair or `transparent`, and nothing else.
This commit is contained in:
creatixchu
2026-08-04 15:05:32 +08:00
parent 3c436d781e
commit a030397aca
20 changed files with 430 additions and 28 deletions
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apps/web/tests/snapshots/sidebar-scrollbar/geometry.expected.md
+6 -4
View File
@@ -2,14 +2,15 @@
## Light palette
- --dsh-scrollbar-thumb, pointer outside the sidebar: rgba(0, 0, 0, 0)
- scrollbar-gutter: stable
- ::-webkit-scrollbar width: 8px
- ::-webkit-scrollbar-track background: rgba(0, 0, 0, 0)
- scrollbar-width: auto
- scrollbar-color: auto
- ::-webkit-scrollbar-thumb:hover declarations: var(--dsh-scrollbar-thumb-hover)
- --dsh-scrollbar-thumb: rgb(229, 229, 229)
- --dsh-scrollbar-thumb-hover: rgb(212, 212, 212)
- --dsh-scrollbar-thumb, pointer over the list: rgb(229, 229, 229)
- --dsh-scrollbar-thumb-hover, pointer over the list: rgb(212, 212, 212)
- list overflows: true
- reserved band: 8px
- relative time covered by the bar: 0px
@@ -18,14 +19,15 @@
## Dark palette
- --dsh-scrollbar-thumb, pointer outside the sidebar: rgba(0, 0, 0, 0)
- scrollbar-gutter: stable
- ::-webkit-scrollbar width: 8px
- ::-webkit-scrollbar-track background: rgba(0, 0, 0, 0)
- scrollbar-width: auto
- scrollbar-color: auto
- ::-webkit-scrollbar-thumb:hover declarations: var(--dsh-scrollbar-thumb-hover)
- --dsh-scrollbar-thumb: rgb(60, 60, 61)
- --dsh-scrollbar-thumb-hover: rgb(84, 85, 87)
- --dsh-scrollbar-thumb, pointer over the list: rgb(60, 60, 61)
- --dsh-scrollbar-thumb-hover, pointer over the list: rgb(84, 85, 87)
- list overflows: true
- reserved band: 8px
- relative time covered by the bar: 0px