If you select a commit that has a really really long commit message, the "details" tab will try to fit that message in one line in the label for "Subject:", and cause the window to expand. What's more, you are *unable to resize the window to make it smaller* for as long as that commit is selected in the history view.

i suggest using word-wrap instead (as opposed to truncating the message with "..." as is the case for the "Parent:" field)