[BUG?] Repeated string escape = error

Using any string escape more than once in a *editor_command variable
within the '.slrnrc' file always leads to an "Invalid Editor definition"
error message. Example:

	set post_editor_command "echo ciao >>'%s' && vi +%d '%s'"

Or also:

	set post_editor_command ""
	set editor_command "echo %d && sleep 5 && vi +%d '%s'"

ISTR older slrns giving me grief about this issue too, so it's probably
an old bug (provided that it's not intended behaviour, which would
surprise me).

Regards,
DN

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