It is not sufficient to simply drop the first source
of a region. While destroying a whole-file region marks
all its sources as unused, only the source for 1st channel
was explicitly removed.
The session accumulated <Sources>, without corresponding
whole-file Regions. Those can prevent cleanup of unused
sources, particularly when using snapshots.
This is mostly a simple lexical search+replace but the absence of operator< for
std::weak_ptr<T> leads to some complications, particularly with Evoral::Sequence
and ExportPortChannel.
When importing a multi-track MIDI files with identical track-names,
Ardour would create the same file for each track. Effectively
overwriting an existing file.
The following MIDI file would create the same file twice
in `interchange/`, once for each MTrk.
```
MFile 1 2 240
MTrk
0 Meta SeqName "Foo Bar"
0 TimeSig 4/4 24 8
0 Tempo 666667
0 Meta TrkEnd
TrkEnd
MTrk
0 Meta TrkName "Foo Bar"
0 On ch=10 n=36 v=95
...
```
This is in preparation for allowing to drag trigger-regions
or trigger-slots. Those will not use a static singleton
PublicEditor API.
Additionally this constrains Ardour-internal drags to Ardour
(via Gtk::TARGET_SAME_APP).
This fixes multiple selection. The original code using
"selection_countdown" is no longer in place. There's no "counter" to arm.
Shift/Tab name edit works regardless.
"s/m/r" solo/mute/rec shortcuts in the treeview have been discontinued
since a long time as well. Keyboard shortcuts are per window, regardless
of grab_focus()
PS. This change makes it easier for a user to start a drag/drop
operation of multiple regions. That currently assert()s, only
the first selected region is used.
Copyright-holder and year information is extracted from git log.
git history begins in 2005. So (C) from 1998..2005 is lost. Also some
(C) assignment of commits where the committer didn't use --author.
This preserves the stereo-ness of files that were imported or recorded in stereo.
ToDo (maybe someday): provide a disclosure triangle that exposes the individual channels in a multichannel region
