fix: a cursor readout quotes the nearest stored sample, not a value between two

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The crosshair and the cursors pane's mix values are one library call, and it
interpolated linearly between the two samples bracketing the pointer. That is
wrong twice over here. Ingest decimation is a boxcar average over `time_stride`
samples, so a number computed between two stored samples is a second, undeclared
estimate laid over the first that nothing on screen or in an export holds. And
past the sample spacing the polyline is a line the renderer drew, so quoting a
point on it reports the drawing rather than the data.

The fix is upstream and unconditional (plotter c028f48): `crosshair_span()`'s `t`
selects the nearer end instead of blending, with a tie reading the earlier
sample. `CrosshairRow::marker` is placed from the same y, so the dot follows the
quoted sample.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Martino FerrariandClaude Opus 4.6 committed 2026-10-05 13:45:21 +02:00

1 parent ec93a9831d

commit d03c9fb443

5 files changed

+37 -7

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Submodule deps/plotter updated: 26a7c82a80...c028f48fa0.