- MediaStore fast path: Kotlin's ContentObserver queries MediaStore
for images added in the last 120s and writes path|added|size lines
to .ms_recent, then wakes Rust via the proven zero-arg
nativeFsChange() JNI. Rust upserts those rows and emits
immediately — a camera photo appears in ~1s without waiting for
the ~10s FUSE re-read of a 10,000-file directory. (Direct
Kotlin->Rust JNI string passing and Rust->Java calls crash under
the emulator's x86_64->arm64 native bridge; file handoff plus
zero-arg JNI is the only reliable channel.)
- js-ready handshake: the first gallery-files emit fires ~30 ms
after process start, before the WebView's JS exists (Tauri events
are fire-and-forget, so it was lost). JS now signals
'gtauri-js-ready'; Rust re-emits the current state.
- Virtualized grid: the document is ONE spacer (full scroll height)
plus ONE band of recycled cells pinned by transform — ~80 DOM
nodes total for a 10,000-photo library. Launch cost no longer
scales with library size; the first screen renders as soon as
the WebView boots and the first thumbs arrive.
- 'Missing photos' report resolved: the full walk of the 9,961-file
Camera dir enumerates exactly 8,438 images with no guard firing;
the difference is videos, which a photo gallery correctly
excludes.
Greg Pomerantz
9e52dc0355