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If you select text in the editor, drag the text by mouse to another line and drop, then undo, the text appears twice. Steps to reproduce: - Open a (Java) source file - Select some text in a line (let's call it line A) - Click on the selection and drag it to another line (line B) - Now the selected text is cut from line A and pasted into line B - Now press CTRL-Z to undo the last action As a result, the selected text appears twice in line A and in line B. I was able to reproduce it on different machines, all running 6.8.
*** This bug has been marked as a duplicate of bug 60560 ***