GSoC 2026: Event System meta issue

[Gnefil]

This meta issue holds a dynamic log of planned and ongoing tasks, around enhancing the event system in MNE.

Following tasks/issues (some of these could have been separate issues/PRs):

• Channel ordering bug in mne.viz.plot_compare_evokeds when axes="topo" #13924
  • Main changes:
    • Fix misaligned channels in multiple Evoked instances that are treated as aligned bug
    • Fix the non-default-ordering channels placed wrongly as the default ones bug
  • PR: Fix channel ordering #13943
• ENH Equip mne.viz.plot_evoked_topo with TimeChange event #13928
  • Main changes:
    • Enhance plot_evoked_topo with TimeChange behaviour - vertical bar
    • Enhance plot_evoked_topo main and subfigures, both react to TimeChange and is able to publish
    • Enhance ui_events.link, allow recursive option to link the groups the figures belong to too
    • API change in mne.viz.iter_topography, the on_pick callable accepts new parameter orig_fig that refers to the main figure
  • PR: ENH: Implement TimeChange behaviour for evoked_topo and recursive option in link #13968
• ENH: Add TimeChange behaviour in plot_evoked #14024
  • Main changes:
    • Fix in mne.viz.plot_evoked, spatial_colors is not "auto" by default, as described by docs or like mne.Evoked.plot
    • Fix the empty topo map bug when clicking after time range selection in plot_evoked
    • Enhance plot_evoked with TimeChange behaviour - vertical bar, able to subscribe and publish TimeChange event
  • PR: ENH: Add TimeChange behaviour to plot_evoked #14025

Monitoring:

• BUG: Unexpected plot discrepancy when plotting as script compared to running in IPython #13956
• ENH: Show the current time as a vertical line in plot_evoked_topo #14032