Percent repeats at line breaks (v2.7.12)

[Thies Albrecht]

Hi everybody!

Any idea or hint on how to automatically expand percent repeats once at 
line breaks. For example

   \repeat percent 50 {c d e f}

should lead to several line breaks. At each new line the repeat should 
be unfolded instead of printing a percent symbol.

A question about that by someone in an earlier thread never led to an 
answer.

Kind regards,
Thies