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Several methods assigned v.ox and v.oy directly: SetOrigin, CopyContent,
the wrap/autoscroll branches in draw, FocusPoint, and
Scroll{Up,Down,Left,Right}. Funnelling them all through SetOriginX and
SetOriginY gives a single place to observe (or set a breakpoint on)
every change to a view's scroll position, which makes debugging scroll
behaviour much easier.
This means those call sites now also get the setters' `< 0` clamps, but
that is behaviour-preserving in every case: each assigned value is
already >= 0. calculateNewOrigin never returns a negative number;
CopyContent copies origins that are themselves always >= 0; and the draw
and scroll writes are all guarded (or fed only non-negative amounts) so
the result can't go below zero.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>