fmTextDiff: Offline Diff Function

[mrwatson-de]

fmTextDiff needs an offline function for diffing.

Particularly, now that it is not yet working with the new IETF API 2, a simple offline diff function would be great.

I've found a simple diff function from Goya on the FM community.

This is perfect as an offline solution for now.

And a great start into the world of FM ⭤ JavaScript interactions :D.