* allow to update IR data
* allow to use mono processing in base-class
This is handy for FIR (Readable/ROM), and operating directly
on local data (ratherer than mapped buffers)
Usually C++ class instance has the same mem address as its first parent.
LuaBridge uses this to for derived classes. A TemopPoint instance has
the same address as its parent Tempo. However due to virtual inheritance
this was not the case due to a lack of virtual d'tor.
Now the following Lua code works correctly
```
tm = Temporal.TempoMap.read()
tp = Temporal.timepos_t (0)
print (tm:tempo_at(tp):note_type())
```
Previously the last line failed calling Tempo::note_type()
on a TempoPoint instance, due to memory offset e.g.
TempoPoint: 0x600000ff90e0 Tempo: 0x600000ff90e8
For some reason applying the property change
plist.add (Properties::start, std::numeric_limits<timepos_t>::min());
does not correctly reset the offset of the newly created region.
The during trim-front, the call order is
1. Region::set_position_internal
2. Region::set_length_internal
::set_position_internal sets `_last_length.set_position (position());`
but the later call ::set_length_internal does `_last_length = _length;`
This sets last_position() == position(), and later Region::mid_thaw()
does not call Region::recompute_at_start().
Region gain envelope was not updated.
see also 00a1b7cb24 and 13d10582f0
This regressed with changes to SMFSource to unconditionally load
the model. "Black MIDI Trilogy 2" now shows again in under 4 sec.
Before this change it took roughly 3 mins (!) and the UI was marked
as unresponsive.
This partially reverts eced764480. In many places Ardour uses
SMF directly, without loading the MIDI model in a libardour SMFSource.
In this case no information (track, channel-count) was available,
after eced764480, and worse various members were not initialized
and showed random numbers.
This fixes various import options.
Previously, the copied source file only contained data within the initial region bounds. This
meant that you could not trim the (unlinked) copy to beyond its initial bounds. Seems wrong.
Confusion caused during nutempo development when a boolean related to nick_m's old
"for music" concept ended up becoming the "auto_partition" argument instead
