set-transient-map: Howto avoid annoying "," in %k

[T.V Raman]

Function set-transient-map  allows  one to use %k as a format modifier
to display the list of keys that would continue the transient, works
well almost all the time --- except when:

"," itself is a key in the transient map; at which point the message
"Repeat with %k" turns into "Repeat with ,,." if your transient binds
"," and ".".

Not sure how to avoid the somewhat weird looking doubled ","


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