The "apply after mounting" checkbox clicked Auto Centering as soon as the
status poll showed a new sample id. /sample/mount still holds the hw lock
at that point, /alc/center_loop takes the same lock non-blocking, and the
resulting BeamlineBusyException is a quiet error the GUI swallows. So the
automatic click never did anything; only a later manual click worked.
Arm on the sample-id change and click on the first status tick with
busy=False, which is exactly what the user did by hand. Skip arming while
queue automation runs: it mounts and centers on its own and frees the lock
between /scan/auto calls, so a GUI centering in that gap would steal the
lock from the next scan. Pause during a scan's mount phase can still arm
that one sample, but Pause ends in an unmount, so the window is a ms-wide
lock gap sampled at 2 Hz; accepted, noted in the code.
Supersedes the three-commit approach on
fix/auto-center-after-mount-wait-idle (PR 243).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
duan_jandClaude Fable 5.1
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