[dev] how to debug address completion?

[Sebastian Birnbach]

Address completion in IMP Webmail does not work on my system. After
entering 3 characters I get a brief indication of action (a tiny spinning
globe in the composition window) but no address gets found ever. I wonder
if this is JS or server side functionality and how I could go about
debugging this.

I am using a global shared address book and no user is allowed a private
address book. Where do I look first?

Kind regards

  Sebastian