Updating of currently selected note smoother
Updating of currently selected note smoother

Added logic so that when a newer version of a note has to replace
the currently selected one, more care is taken to minimise visual
glitches.

yuuki0xff/nvpy,bwillistower/nvpy,trankmichael/nvpy,yuuki0xff/nvpy,n8henrie/nvpy,dwu/nvpy,khornberg/nvpy-gtk,dwu/nvpy