[jaladh-singhal]

Fixes FIREFLY-2155

Loading spectral lines hung the browser in multi-chart views, e.g. Euclid's data product spectra (one row → 3 spectrum charts) and Pinned Charts after using Zoom/Pan. Plotly emits plotly_selected on its own whenever it fully redraws a chart whose layout.selections (the persisted box/lasso selection outline) is set, even to [], which Firefly sets after table selection syncs, Zoom/Pan and clearing a selection. PlotlyWrapper treated that event as a user selection and activated the chart; activating one chart re-rendered the others, and with spectral lines on that re-render became a full redraw, so the charts kept activating each other in a loop.

A chart is now only activated on plotly_selected after a plotly_selecting event, which Plotly only emits during a user's box/lasso drag.

Testing

https://firefly-2155-line-plotting-bug.irsakubedev.ipac.caltech.edu/applications/euclid/

• Search by ID → DR1, deep_survey, 2626785781669233495 → Spectra tab → Spectral lines → load SPHEREx line list → all 3 charts get lines, no hang

https://firefly-2155-line-plotting-bug.irsakubedev.ipac.caltech.edu/firefly/

• Pinned charts: upload any 2 spectra, check "interpret as spectra" and pin each → Pinned Charts → click each chart and then Zoom (or Pan) in the toolbar → Spectral lines → load SPHEREx line list → lines plot, no hang; toggle the lines' select-all a few times → still responsive
• Regression: clicking a chart, or box/lasso selecting on a chart that isn't active, still makes it active; select/filter on the box selection still work

[kpuriIpac]

Looks good. Thanks for the fix!
Testing works as decribed.

[lrebull]

confirm this works! thank you!