Rewording of the window behavior preferences
The preferences for the window behavior were difficult to understand until you set each one. The attached patch rewords them:
Old wording: Use only one message _window: Never Always Always (with Roster) Per account Per type
New wording: _Window behavior: Detached roster with detached chats Detached roster with single chat Single window for everything Detached roster with chat grouped by account Detached roster with chat grouped by type