Mne-python: ENH: Add pop-up key mapping for PyVista stc.plot

[SophieHerbst]

@GuillaumeFavelier maybe this already exists: is there a way to move continuously through time on an stc, by holding for instance the left/right arrow key? The playback speed scaler sets the step-size on the time-axis, but I still need to move the mouse across the time scale, which is a bit inconvenient, and hard to do continuously.

[agramfort]

did you try pressing space bar?

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[SophieHerbst]

I did not (what a narrow concept of time). Cool!
What is the shortcut to bring up a legend / help ?

[agramfort]

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What is the shortcut to bring up a legend / help ?

it does not exist yet :) to be consistent with other plots it should be 'h'

[GuillaumeFavelier]

That would be nice to have considering the number of toggles/shortcuts has increased in TimeViewer. I noted this idea in #7162 :+1:

[larsoner]

This window that pops up can just be a new / separate matplotlib figure like we do in all of our other plotters. @GuillaumeFavelier it might be worth refactoring the code to make a new function that takes a list of (shortcut, description) pairs and pops up a new window with the list.

[GuillaumeFavelier]

If we plan to reuse MplCanvas, this requires https://github.com/mne-tools/mne-python/pull/7247 to be merged

[larsoner]

I wouldn't reuse MplCanvas, I would actually pop up a window for this one. So you can just do a new plt.figure