this prevents the case where have enabled snap, and you add a note that
appears to be on a bar line. but actually it is {some Grid value} off,
it just looks right because of pixel rounding.
This fixes the issue where you click to create a note, but move the mouse
just a little, resulting in a note of invisibly small length
Do the calculation in ::motion so it displays the final
size while you are dragging. "what you see is what you will get"
* move abort_reversible_command into the correct bracketed location
* check for missing _session at top of function to avoid unnecessary nesting
* this fixes an undo 'assert' when an action like "clear xrun markers" has no effect
* this was likely a copy+paste thinko since they are adjacent in the code
these functions operate on the _note_diff_command,
which is explicitly a NoteDiff, not a generic DiffCommand
also fix a few thinkos where the ambiguous naming led to errors
syntax for beginning and ending a diff command is:
"new_diff_command" -> "apply_diff_command"
syntax for applying a diff_command is:
"_as_commit" : Begins and Commits a standalone undo Command
"_as_subcommand" : adds to undo but does not Begin or Commit a Command
"_only" : (new) applies the note_diff but does not have any effect on undo
This is useful after a freewheel export, where a realtime-stop
is called, but the actual Locate/MustStop event is only processed
later. Once the session switches back to normal processing after
export the transport is still rolling, TSFM schedules a de-click
locate. This may play some remaining audio.
This new API allows to hard stop the transport, without going
via any session-events and process_with_events. It is intended to
be called from the freewheel process-callback in the last export
cycle.
The idea is to run a plugin outside the process graph, and provide
its I/O as port (much like an external JACK app).
The intended use-case is NDI (provide additional I/O), but it could
also be useful for other cases.
