It's a feature request. Pidgin from version 2.4.0 does not allow to resize input field manually - developers are denying to make it optional, but some one wrote a simple plugin, which does to job. Is there any chance to have this plugin included in Fedora repo? Plugin is described here: http://developer.pidgin.im/ticket/5296
This will not be included in the Pidgin package. Feel free to package it up separately for inclusion in Fedora, following the standard procedure for introducing new packages in Fedora.