deps: go-widgets/window v0.63.0 — GTK presents on demand - #281
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v0.63.0 makes the GTK4-hosted Linux backend present only when the app requests a frame (window.Repainter, gated by the reader's NeedsPresent) instead of blitting every vsync — idle presents drop ~15× with the UI unchanged. No reader code change; the present loop already advertises the gate the backend now honours.
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v0.63.0 makes the GTK4-hosted Linux backend present only when the app requests a frame (
window.Repainter, gated by the reader's existingNeedsPresent) instead of blitting every vsync — idle presents drop ~15× with the UI unchanged. No reader code change; the present loop already advertises the gate the backend now honours.