#28 Pane playback keyboard shortcut

[Craig Stuart Sapp]

I would find a keyboard shortcut (such as alt-space)
very useful when correcting annotations. This key
would play the visible pane once and then stop and
move the playback cursor to the middle of the pane
when it is finished playing the current pane.

This is useful for when a time instant has been
changed just after stopping the playback, so that
the change can be verified by listening to that
region of audio again.

Currently I have to scroll with the waveform navigator,
or use the arrow keys to move the desired playback start
point to the central cursor. However, I often visually
loose the place that I was editing because everything
is moving around.