The zoomed map view resets the viewport to the full render size when done;
the HUD layer shifted that reset past the render target, SetViewport failed
and the map's 256x256 viewport stayed set, clipping the cursor. Full-width
viewports at x 0 are no longer shifted.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>