Fix reverts of self-canceling and non-current sequences, show effective tag changes on UI#593

MareStare wants to merge 3 commits intophilomena-dev:masterphilomena-dev/philomena:masterfrom

MareStare:feat/post-refactoring-and-fixing-tag-revertsMareStare/philomena:feat/post-refactoring-and-fixing-tag-revertsCopy head branch name to clipboard