- open a new pane (same document in both panes)
- Select something in one of the panes and cut it
- Switch to the other pane, and press Enter somewhere (to create the line where you want to paste what you cut)
Result: focus switches back to the pane where you did the cutting, so if you paste at that point, you simply put the cut contents back where they were.
Expected result: focus stays in the second pane, so if you paste at this point, the clipboard contents are pasted in the new line you created there.