I would have loved to split this apart, but there are just so many interrelated changes,
it makes little sense and would be a huge effort that would break future git bisect
use because so many intermediate commits would not compile
This also removes Route::group_gain_control() and associated machinery.
Not yet tested with Mackie or other surfaces. More work to done to
start using the group capabilities, and also potentially to add
or derive more controls as RouteAutomationControls
ControlBoxes are created/destroyed regularly (plugin re-order,
track selection -> Editor Mixer,...).
Properly disconnect the timer signal in the dtor and skip updateing the
tooltip unnecessarily (duplicate calls, Changed & Timer).
This should really be undone, the timer needs to be removed and Changed() used throughout.
This is not a real fix; just a stop-gap for the worst offender.
iostream on OSX is not thread safe.
Sadly no crash report so far managed to catch the 2nd thread in action.
looks like the GUI thread is preempted, 2nd thread succeeds, and the
crash occurs later).
see also https://discussions.apple.com/thread/3479591
crash in
s << c->internal_to_user (c->get_value ());
ardour-4.1.335(5000,0x7fff777f5300) malloc: *** error for object 0x7fe2f3e06170: pointer being freed was not allocated
1 libsystem_c.dylib abort + 129
2 libsystem_malloc.dylib free + 428
3 libsystem_c.dylib __numeric_load_locale + 544
4 libsystem_c.dylib loadlocale + 216
5 libstdc++.6.dylib std::__convert_from_v(int* const&, char*, int, char const*, ...) + 193
6 libstdc++.6.dylib std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_float<double>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, char, double) const + 193
7 libstdc++.6.dylib std::ostream& std::ostream::_M_insert<double>(double) + 221
8 ardour-4.1.335 ProcessorEntry::Control::set_tooltip() + 854 (processor_box.cc:578)
9 ardour-4.1.335 ProcessorEntry::Control::control_changed() + 446 (processor_box.cc:637)
10 ibpbd.dylib PBD::StandardTimer::on_elapsed()
when copying a plugin the state is transferred by serializing
XML and setting state from XML. This state includes the unique ID.
This ID needs to be identical at first in order to load
the state from <session-dir>/plugins/<ID>/*
