When you paste some text on top of a different piece of text, the selection gets replaced by the pasted text, and this is useful.
If the pasted text is equal to the selected text, nothing happens, thus not useful.
What I purpose is to smarten up this behavior by evoking the duplicate command (super+shift+d) when the selected text is equal to the pasted text.
This would allow for people to use Copy+Paste instead of having to learn a new shortcut (super+shift+d).
This ability would extend also to duplicate line should this related feature get implemented along.
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