Media Browser error handling for file read failures
Raw Developer Origin & Technical Request
GitHub Issue
Oct 7, 2026
When a selected file cannot be read, Media Browser Add Files silently leaves the folder empty. The selection promise rejects, but the application drops that error without explaining the failure or offering a retry. A subsequent healthy selection works.
## Environment
- Fresh browser build of current main `e38a92e792c07f1c57c5dcfcab37d91932b9e2b8`, verified 2026-10-07; Rust 1.95.0, wasm-bindgen 0.2.129.
- macOS 26.5.2 arm64; isolated Chrome 154.0.8037.93 and Firefox 155.0, headless.
- `?empty&storage=memory&noworkers&nosw`. Firefox uses built-in browser test preferences to deny optional persistent-storage permission; the actual StorageManager method is unchanged.
## Controlled reproduction
1. Generate an original valid PNG named `red-corner.png`. Open Window → Media Browser. Widen its panel until the actual Add Files toolbar button is visible.
2. Before selecting it, wrap `File.prototype.arrayBuffer` so this named file alone returns a rejected promise with `DOMException("Generated unreadable selected file", "NotReadableError")`. Delegate all other calls to the original method and record the injection.
3. Click the real Add Files button using its on-screen registered rectangle, and provide that file through the actual browser file chooser. This uses a real browser user gesture and the production input/change handler.
4. Wait for the read, inspect Media Browser, the full editor screenshot and UI status.
5. Restore the original File method and select the same file through the...
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