I like it (see #519), but can you clean up the commit a little bit? We shouldn't leave the console application with the callback code activated, for example, as well as the other commented out code.

More importantly, are you certain that the generic approach works for EVERY existing string? A quick scan doesn't look like there would be any issues. One concern, though, is if you take a look at e.g., TC_TXT_HELP_3, by swallowing the newlines, you're also swallowing the vertical spacing. Maybe it's not a concern.

I'm looking at this quickly, but if a string ends with two newlines, are you going to overrun the string that you're copying?

I wonder if it's not time to finally just remove the newlines from the source, and perform wrapping in the console application. This has been done and rejected before.

Let me know your thoughts.

Whatever the case, I may defer this a couple of weeks in order to issue a stable 5.8 release with strings as they are, and make this the first commit on 5.9.