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fix(app): prevent white flashes between workspace routes

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Nested native stacks fell back to the navigation library's light background during cross-stack swaps. Share the active app surface color across every stack without subscribing route layouts to all theme runtime changes.
This commit is contained in:
Mohamed Boudra
2026-07-12 00:27:40 +02:00
parent d28e174b38
commit 92d7066601
4 changed files with 49 additions and 15 deletions
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docs/expo-router.md
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@@ -96,6 +96,18 @@ Keep workspace identity and retention outside native-stack `getId` and
Navigation `getId`, and `getId` has broken Android native-stack/Fabric by
reordering an already-mounted workspace screen.
Use `ThemedStack` from `packages/app/src/navigation/themed-stack.tsx` for every
Expo Router stack. React Navigation otherwise paints each native stack screen
with its light default background. A screen-level wrapper can hide that surface
while settled, but Android may expose it for one frame when navigation crosses
from a nested stack to its parent stack. This is especially visible when an
app-wide route such as `/new` opens from a dark workspace.
Do not read the active theme with `useUnistyles()` in a layout to build
`screenOptions`. `ThemedStack` keeps that third-party prop theme-reactive through
a small `withUnistyles` boundary without subscribing the route tree itself to
every Unistyles runtime update.
## Regression Shape
Pure helper tests are useful but not enough. The failure mode here is native