A plugin that allows to merge the roster and conversation windows into one in Pidgin.
Install 'pidgin-window_merge' package, go to Plugins and enable the 'Window Merge' plugin. You may want to resize the roster window first time to see the conversation part.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/eischmann/pidgin-single-window/