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Add an opt-in on_demand render policy for the custom renderer. Static windows skip builds (and, on Metal, draws) until input, animations, tooltips, refresh() or dispatcher work invalidate them. Continuous rendering stays the default. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
tomaszbk
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The custom renderer builds the initial scene and then updates it when input, model actions, surface changes, animations, deadlines or queued worker work invalidate the window. Idle callbacks reuse the retained tree; on-demand scheduling is the renderer contract.
The coordinator coalesces requests, preserves invalidation raised during a frame, suspends visual work while iconified, restores the surface and rejects work posted through a closed window's dispatcher. Control setters request paint without rebuilding the application.
render_stats()exposes callbacks, builds, draws and pending work;ui_dispatcher()delivers worker callbacks on the UI thread.Metal skips idle draws. GL/EGL/D3D repaint the retained tree when their platform callback presents the swapchain. Native controls use their platform refresh mechanisms.
The scheduler, VML runner configurations and acceptance fixture now use automatic on-demand scheduling. The public guide explains invalidation and the backend presentation behavior; the branch includes the current upstream master.
Validation on macOS arm64 with V
e96232c, the C backend, default Boehm GC and compiler fallback disabled: