10.8.3/Terminal 2.3.
Terminal resizes the entire window in seemingly unpredictable ways whenever I change the size of the font -- a frequent operation when frequently going between laptop and external displays.
Is there some way to prevent this? iTerm seems to do the same thing.
Update: Based on @robmathers' answer below, it seems likely that what I want isn't possible. Can anyone recommend any OS X terminal emulators that don't have this feature?