Cursor jumps to the beginning of file when using undo (CTRL+Z) after file was saved

When I write something in the editor, then save the file I'm working on, and then press CTR+Z the cursor jumps to the first line of file and nothing else happens. When I press CTRL+Z one more time editor undoes as expected.

This doesn't happen when I don't save the file between writing something and hitting ctrl+z.

This bug was introduced in the latest stable release - qtcreator 2.0.0.