Constant BEGIN_PAINT_RETIRED 

pub const BEGIN_PAINT_RETIRED: &str = "`beginPaint` is gone: a repaint keeps its nodes by drawing through the retained tree — `vdOpen`/`vdText`/`vdClose`, then `vdCommit` and `vdApply` — which an LGX component's view does for you.";

What a call to beginPaint is refused with, on every tier.