Query how Juce reorders channels

[reuk]

See also:

Logic Pro wrong channel layouts

I’ve lost the best part of a day to this issue, but I think it does mostly work after all. Logic caches channel layouts of plugins in a slightly obscure way that doesn’t always seem to be cleared by running killall -9 AudioComponentRegistrar. This means if you modify the isBusesLayoutFunction and reload the plugin in Logic, it’s not guaranteed to query the allowed bus configurations. I think I must have accidentally tested and debugged with a plugin that had cached channel information. After cha…