Fixes #5358. Narrow draw pipeline to skip parent on child-only redraws#5431

Merged

harder merged 14 commits into

gui-cs:developfrom

harder:fix-5358-stop-child-redraws-escalating

May 28, 2026

Commits on May 26, 2026

Gate self-content draws on needsDrawSelf to stop child-only redraw fan-out

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Clarify why DoDrawAdornments still escalates NeedsDrawRect

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Stop AdornmentView.OnClearingViewport from cascading SetNeedsDraw during draw

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Add focused regression tests for child-only redraw gating

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Switch fan-out tests to NeedsDraw-gated metrics (DrawingText) for #5358

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Fix SetNeedsDraw union math to accumulate dirty regions accurately

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Make ClearViewport region-aware when NeedsDrawRect is partial

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Invalidate SuperView on Frame change so uncovered area gets cleared

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Document the remaining LayoutAndDraw force=true cascade source

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Invalidate SuperView in SetFrame too, add region-aware ClearViewport tests

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