_COARSE_PREVIEW turns off the two-pass draw: every view now waits for the
whole picture, standing on the last frame's ground reprojected until it
lands, or on nothing where the view has run past that too.
None of the machinery goes. Both passes still draw, render_ground still
takes coarse=, and the abandonment point between them is still where a
held pan key gets off — what the switch decides is only whether a moved
view is offered the first pass, which is why it is read where the raster
is asked for and not inside the renderer. Turning it back on is one line.
The abandonment test needed to say what it means to survive the change:
it asserted no finished pass appeared in a list it read after the loop
closed, which quietly depended on the *next* view's draw not getting a
scheduler step in time. It reads the list where the abandoned key's draw
returns now, and asks only about that key.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5
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