Undo accidental merge?

I accidentally merged some files, then pressed undo a couple of times, which actually undid a whole bunch of my writing in the first of the three files merged. Now I can’t get it back! Help?

The “redo” command should undo the undos just fine. Make sure you’re in the right document to do so however. Undo and Redo are not application universal. Each document has its own separate history. To undo merging, however, just use the Documents/Split/ sub-menu to get things back to how they were. Do that after you redo the mistaken undos.