The waveform shift point  => until now end of currently showed part of the waveform. when you are adjusting paragraph borders, the problem is: the end of last paragraph is not shown (probably). So you have to wait to the waveform shift to adjust the end of last paragraph.
The waveform shift point  => until now end of currently showed part of the waveform.
when you are adjusting paragraph borders, the problem is: the end of last paragraph is not shown (probably). So you have to wait to the waveform shift to adjust the end of last paragraph.

Now the shift point is adjusted to the begin of a last shown paragraph. (when it is shorter than 1/3 of waveform and its end is not on the screen)
=> paragraph containing the play cursor is now shown whole in most cases

Ttxman/NanoTrans