aa69fe49f5
Previously when the master-bus had more outputs than inputs, Ardour crashed when the monitor-section was set up. Removing a master-bus output port calls Route::output_change_handler (master-bus) -> Session::reset_monitor_section which first removes the corresponding monitor-section input, then output port. The latter triggers ARDOUR::Route::output_change_handler (monitor-bus). All with the process-lock held, so at this point in time Ardour has removed the port-reference but the port still exists in the backend. Now the monitor-bus processors are re-configured and the channel-count is updated. The port that was just removed and triggered the ::output_change_handler() callback is re-created. unable to create port 'Monitor/audio_out 2': failed constructor This fix changes the monitor-section to use strict-i/o (for plugins) and also use master-bus output (not input) when configuring processors.
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