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The browser tab is a Repainter; Repainter's doc names every backend - #140
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The tab backend could not be woken: a result arriving on a goroutine stayed off the screen until the next click. It now implements Repainter through webcanvas v0.4.0's RepaintWith -- the next animation frame redraws the tree. Repainter's doc said macOS only; X11, Wayland, GTK, Win32 have it too. The README shows the whole pattern: mvvm.Queue with Repaint as its wake, drained in the root's SetBounds. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Repainter:Repaint(any goroutine) asks webcanvas v0.4.0 (RepaintAware, verified in headless Chrome there) for the next animation frame.Tree.RepaintWith/Repaintuse atomics; tested under-race,internal/tabstays at 100%.Repaintersaid "Implemented today by the macOS (Cocoa) back-end"; X11, Wayland, GTK and Win32 implement it too (compile-time assertions in open_*.go).NumberedandPlacementreally are Cocoa-only and keep their sentence.QueuewithRepaintas its wake, drained in the root container'sSetBounds.First user: the go-fileshare admin console. To be released as v0.88.0.
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