If this is not a bug or extremely not-user-friendly behavior, then I would like to point everybody's attention to the fact that Columns are not stored as files- and probably because of that they do can be CANCELed without a problem. What is then so dangerous about Columns that we needed a safe button for them in the first place and for for exports we did not [and as I guess we will not get]?
All in all, Mp3tag various options are unfortunately highly inconsistent:
- Main options: user can cancel all changes
- Columns options and entries: user can cancel all changes
- Actions options and entries: user can cancel operations on individual actions within one group [except a clearing of a list of tag fields available for a "Field" box], but cannot cancel tasks done on groups
- Exports options and entries: user cannot cancel changes aside from two check-boxes