code: def disabled_event_channels():
      """Fixture that makes sure each test starts with a fresh disabled channels set."""
      ui_events._disabled_event_channels.clear()
      return ui_events._disabled_event_channels
  
file_path: mne-python/mne/viz/tests/test_ui_events.py
imports: import matplotlib.pyplot
  import pytest
  from mne.datasets import testing
  from mne.viz import ui_events
label_desc: Use image node_id 3 for calling a global function with example usage: disabled_event_channels() and returns: ui_events