[Ardour-Dev] Assertion failure in BaseStereoPanner::distribute()

[Carl Hetherington]

Hi all,

I find that, in trunk, the following sequence:

1. create a stereo buss.
2. add a port to it.
3. remove a port from it.

causes the assert (obufs.count().n_audio() == 2) in 
BaseStereoPanner::distribute() to trip.  The attached patch fixes it for 
me.  The main point of the patch is to ensure that 
BufferSet::attach_buffers() is called when ports are removed as well as 
when they are added.

Any comments as to whether the patch is sensible?

Thanks

Carl
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