Tested under CentOS 7 with Kolab16:

When composing mails in roundcube, the contact search on the left side doesn't work.
I could reproduce this behaviour with the templates Chameleon and Larry.

Behaviour is:
I click into the search box -> The Global address book is highlighted.

Expected behaviour:
I click into the search box -> And I'm able to type in a name

The problem seems to be in the following java script:
https://git.kolab.org/diffusion/R/browse/master/program/js/treelist.js;89a49dd37085d6693b7d7b99d08711695ec88592$186-196

between line 186 and 196.

For testing: I commented out this lines and all worked fine again. I get the same result when I change:

if (!has_focus && selection)

to

if (has_focus && selection)

and

else if (!has_focus)

to

else if (has_focus)