I don't get the external editing to work

[Spliff]

For my main use cases (replacing "a:b" by "a" then newline then "b"), I seem to need external editing indeed, since with the internal (MS) editor, I have not been able to select a newline, or even a double newline, and then feed it into either the "Find" or the "Replace" dialogue; if somebody HAS found a solution to this problem, I'm sure I'm not the only UR user who'd be highly interested in knowing.

On the other hand, a tab CAN be fed into those dialogues; create a tab, select it, then ^c, and ^v within the dialogues: works!