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b96b8a9753
A refresh from the UI thread returns immediately and applies its model and view updates as queued UI-thread callbacks. A key pressed before those have run is handled against the stale, pre-refresh state. For most keys that's harmless, but some handlers turn that state into git commands: pressing space twice in quick succession in the staging panel builds the second patch from the already-applied diff and fails with 'patch does not apply', because the refresh after the first press is what moves the selection to the next stageable hunk. Notably, this is not just a regression of the recent change that made UI-thread refreshes non-blocking; the window was merely much narrower before. A blocking refresh parked the UI thread while the scopes' bounces were queued, and the event loop drains pending keyboard input with priority over queued user events, so a key pressed during the blocked window still beat the queued state updates. The guarantee that the next keypress sees post-refresh state had already ended when the scopes' state updates moved from worker-side mutex-guarded writes to UI-thread bounces. Fix it with the input-blocking mechanism we already use for commit surgery, exposed as a new RefreshBlockingInput entry point: it begins blocking events synchronously in the calling handler, and ends the block from a callback that the finishing step queues behind the refresh's own updates. Keys pressed while the refresh is in flight are buffered and replayed, in order, against the fully refreshed state; since a replayed key's handler re-enters this same path, a burst of keypresses applies sequentially, each one seeing the previous one's refresh. Unlike the old blocking refreshes, this doesn't freeze the UI thread: rendering, spinners, resizing, and mouse scrolling keep working while input is withheld. Blocking input is opt-in per call site rather than the default for all UI-thread refreshes, because most refreshes (the focus-in and startup refreshes, say) don't produce state that the next keypress depends on, and blocking on them would delay typing for no reason. It should also be limited to quick, narrow-scoped refreshes: a full refresh, or any scope that pulls in COMMITS, can take very long in large repos and should usually not hold up input. The staging panel's stage/discard/edit-hunk refreshes use it now. |
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| gocui | ||
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