Cannot revert a file from the commit dialog

It would be convenient if there was a context menu when the user right clicks on a file in the commit dialog that would allow the user to show the changes made and to be able to revert that file (like in TortoiseSVN).

This is useful because when reviewing the changes prior to commit one often sees a change that introduced only whitespace or some trace statements that should not be committed. Being able to revert a file makes sure you don't commit any changes for that file.

It is already possible to see the diffs by double clicking but this should only be a shortcut to the diff option in the context menu.