Behavior of pressing ^K^K is a bit odd — it joins lines.
I can sort-of see logic behind this — killing the \n — but I think forward Delete at end of the line is the typical and safer way to achieve that.
May I suggest making ^K executed at end of a line to behave like Shift ^K? (as if the cursor was after \n, not before \n)
That would be similar to what nano/pico editors do.
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