In some circumstances UI::flush_pending never returns, and all UI
interactive ends up being driven by
while (gtk_events_pending()) { gtk_main_iteration(); }
This has various implications depending on the caller and usually results
in a crash at session-close or exit.
When freq was changed to be an integer, the conversion to kHz became a
truncation. Divide by the float 1000.0 to pass the correct value to the
stringstream formatting routine.
The trim knob has been designed to operate only on audio channels. If
the bus has none, hide the knob that would otherwise have no effect at
all.
Factor the trim control show/hide code out of MixerStrip::set_route(),
and also call that code in response to I/O changes in the route.
Session::process() returns early with Session::_silent set to true. AudioBuffer::set_data()
was never set for (at least) the LTC output port. PortManager::cycle_end() calls
AudioBuffer::silence() which used to assume that get_buffer() must have been called. But it
was not, because that should have happened in Session::process().
So check AudioBuffer::data() and call get_buffer() if required.
The trim processor was moved to the front after the internal return was,
so the trim setting was applied before the signal coming from other
tracks/busses sends was mixed in. Change the order so that trim applies
to audio from internal sends as well.
To export a MIDI region to a file, the code used MidiRegion::clone()
since it takes care of creating a new file-backed source with the wanted
contents. Nevertheless, it had several side-effects:
- it created and registered a new region which is confusing to users
- it only exported notes that were in the region range, but didn't
remove the region start offset from MIDI events, essentially producing
a spurious silence at the beginning of the exported file (this is not
a problem for region cloning because the newly created region is made
aware of the offset and caters for it).
Add a dedicated code path for export, that uses the new offsetting
capabilities of MidiModel::write_section_to().
