more linked midi region trim drag fixes.
authornick_m <mainsbridge@gmail.com>
Mon, 6 Mar 2017 04:51:53 +0000 (15:51 +1100)
committernick_m <mainsbridge@gmail.com>
Mon, 6 Mar 2017 04:51:53 +0000 (15:51 +1100)
commit16089bff96a13b87724bf671dcb9a05de9593343
tree897a60c85d2375f97a067196ac1865b3240037e3
parente7c85706e5553181636e7052f2fe10469b57fd85
more linked midi region trim drag fixes.

- freeze the correct playlists on fiorst move.

- only update the start offset of linked regions once the drag
  has finished.
gtk2_ardour/editor_drag.cc
gtk2_ardour/midi_region_view.cc
libs/ardour/midi_region.cc