Now that Dano has turned me on to the proper use of Actions, it would be nice if once a global Action is executed you could identify which tags were changed via the use of a different color text.
Example:
I do all my edits in a specific folder, I then open Mp3tag to that folder, use Ctrl-A to select all tags and click on the Actions icon. Mp3tag does its magic and when finished it informs me, via a pop-up window, that it did X amount of renames.
Great! But it would be nice if I could identify via a different color text (across the whole tag, not the actual letter/symbol changed) what songs/tags were modified.
I hope that I explained myself correctly and I'm not suggesting something that's already been done or in the pipe-line...
You must be more patient, Florian will answer to your request.
First he is reading and fixing bug reports then support questions and the last are feature requests.
I can see, that this enhancement might be useful for some people, but I don't see the great benifit at the moment and I don't think that it's worth implementing this.
As a workaround you can export the information you want to monitor into an external text file before and after the actions are applied and use an external tool to perform a diff.