fix: the t0 caption is chrome anchored to the axis, not an annotation in the data

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The caption that names the relative x labels' anchor was an `Annotation`, whose anchor
is a data coordinate -- so it crawled across the plot under a pan and drifted under a
zoom, which is how it was reported. It is now `Plot::set_x_note()`: the bottom row's
caption, drawn by the renderer in the axes' bottom-left corner in pixels, on the
legend's own backplate.

The text stays the host's, because only the host knows that label + caption has to be
the exact absolute time (`%.6g`, where `format_time()` would round to three figures).

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

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Martino FerrariandClaude Opus 4.6 committed 2026-10-05 18:21:28 +02:00

1 parent e2985aa159

commit 39f30d913f

6 files changed

+47 -45

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deps/plotter

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Submodule deps/plotter updated: 03c41adbec...59c2e45af7.