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Will Miao
14e660e876
A regular Refresh walked every configured root sequentially, so a full 25 TB drive delayed the roots behind it, and the dialog sat on "Checking for changes..." at 0 % for the whole walk with no way to tell it was working. On a cold external drive the walk itself dominates the cost, so the fix is to overlap the drives and to show what the walk is doing. Backend (py/services/model_scanner.py): * Extract the per-root walk into the synchronous _walk_root_for_reconcile() worker and merge its results on the event loop afterwards, in configured root order: which business path wins a file reachable through several roots must not depend on the order the workers happened to finish in. * Group roots by device (_root_device_key: drive letter on Windows, st_dev on POSIX) and run one worker per device. Roots sharing a device stay sequential, so directory claims and the overlap dedup (#871, #1041) keep their configured-order semantics; different devices run in parallel. * Track walk progress per root (_ReconcileWalkTracker), weighted by each root's cached entry count because the real file count is only known once the walk ends. The bar splits into walk (0-50 %) and new-file (50-99 %) phases so it never jumps backwards, and the walk broadcasts files seen, active roots and the ETA counters. * Replace the Windows case-insensitive fallback -- a scan of every cached path per miss, i.e. O(files x cached) -- with a lazily built lower-cased index (_CachedPathLookups, also now guarding the realpath alias index for worker threads), and lift the os.name == "nt" gate into the module-level _CASE_INSENSITIVE_PATHS so the branch is testable off Windows. * Excluded-model membership is a set lookup instead of a list scan. Frontend: * render the walk phase as "Checking for changes... <roots> (N files)" with the ETA, and reset the ETA tracker when the stage changes: the per-file rate of counting files says nothing about processing them. * add common.scanProgress.walkFiles; the other locales keep the sanctioned [TODO: Translate] placeholder until the translation pass. Verified: no-change reconcile over 10k files/500 dirs 101 ms and 10k/5000 dirs 230 ms (was 93/229 ms, within noise); a two-device sandbox walk runs both roots concurrently, names them in the progress messages and finishes with added=15, removed=0; 3665 passed, 7 skipped; frontend 1456 passed, vue widgets 96 passed.