Suppose I have made a change to a file, hg status show it as modified.
Now I want to commit. Before I can do so I accidentially hg remove my file.
Mercurial now would remove my file on the next commit, hg revert would retain it from removal, my changes would be lost however.
Is exporting a patch and then importing it on top of a MQ my only option to put my file back into "modified" state?
I am not sure about that but try adding it back with hg add.
And you can simply export and apply a patch without MQ.