Bug channel annot merge (#275) #1467

Job	Run time
PyQt5 / ubuntu	2m 35s
pytest matrix / ubuntu / MNE main	8m 4s
PyQt6 / ubuntu	7m 39s
pytest matrix / ubuntu / MNE maint/1.7	7m 48s
PySide2 / ubuntu	3m 8s
pytest matrix / windows / MNE main	9m 37s
PySide6 / ubuntu	7m 54s
pytest matrix / windows / MNE maint/1.7	9m 32s
PySide6 / macos	7m 14s
pytest matrix / macos / MNE main	4m 56s
PySide6 / windows	10m 14s
pytest matrix / macos / MNE maint/1.7	4m 46s
pytest no opengl / ubuntu / MNE main	7m 19s
pytest no opengl / ubuntu / MNE maint/1.7	6m 43s
pytest old / ubuntu / MNE maint/1.5	7m 37s
pytest pip-pre / ubuntu / MNE main	8m 19s
	1h 53m 25s

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