PR #2520fixed#2475 in the wrong layer (overflow classes on
SettingsView.tsx wrapper divs that aren't the actual scroll containers),
so the "no scrollbar in Settings" bug shipped in v1.17.2 unchanged, and
the sessions feed has the same underlying issue (#2402).
The actual scroll containers render through ScrollableOverlay ->
OverlayScrollbar, which hides the native scrollbar and draws its own
JS thumb that auto-hides ~1s after scroll activity stops, with a
second CSS rule fully hiding that thumb inside Settings specifically.
Fix both at the shared component/CSS layer so every consumer (Settings,
sessions feed, git panels, chat, etc.) gets a persistent scrollbar on
desktop shells (Electron + VS Code webview) in one change:
- OverlayScrollbar.tsx: skip the auto-hide timer and show the thumb
immediately on mount when content overflows, on desktop runtimes.
userIntentOnly consumers (chat auto-follow scroll, reasoning blocks)
keep today's intent-gated behavior unchanged.
- index.css: scope the Settings-specific hide rule to non-desktop, so
mobile/web keep existing behavior and desktop gets the thumb back.
Sérgio Pedro
fa63866cbb