ControlProtocols are single instance.
Activating an already active protocol leads to crashes due to
various rasons (e.g. port already registered), re-used singleton
event_loop_name and request-buffers, duplicate free of
AbstractUI request buffers during deactivate,..
When I/O port-counts do not change, plugin re-order happens
in sync in the process-thread. ::configure_io() is only called
to ensure that the current configuration is valid.
In case that the ChanCount does not change, the method must
be realtime-safe and not block.
DiskWriter::reset_write_sources() is not realtime-safe and
implicitly causes a session-save:
Write-sources are destroyed and re-created. This includes
a call to write_source->drop_references(), which triggers
ARDOUR::Session::remove_source(), which saves the session.
Furthermore adding/removing plugins will likewise call
::configure_io().
Previously any processor change on a track lead to
saving the session!
Previously adding percussive-hits created sustained notes
using the current grid as duration. This allowed to create
overlapping notes with the overlap not being visible.
Most hardware MIDI drumkits do send an immediate note-off event
after each hit (if they send note-offs at all).
Ardour now follows suit and does the same when using the draw/edit tool.
* Reserve 32 dedicated editor actions for scripts
* Limit number of toolbar buttons
* Use dedicated binding-group for keyboard-shortcuts
* Tweak Preferences layout of toolbar pane
Changes need to be propagated to the Stripable's PresentationInfo.
So far this was not done for batch-changes using the mixer's left
side-bar "Show all", "Hide all" actions. They remained local
to the mixer and were not persistent.
StripSilenceDialog will now retain its threshold, minimum length, and
fade length values from run to run.
This is done via Session::add_extra_xml() and recalled during the
construction of StripSilenceDialog via Session::extra_xml()
