After my error earlier, Iget an eye on RTFand Xojo 2019r1.1.
Of course, I loaded rtf files created with TextEdit (Apple, rtf) to find
l’image is translated to
l\u146 image (l<invisible code>image), some vowels with diacriticals disappears (<é> encoded as <\u233 >), etc.
So, I checked within wikipedia (english), but RTF does not seems to be deprecated from Microsoft, but not updated since 2008 (that is 11 years ago) :(
For Xojo, this bug exists since… ages, and making a TextArea doing something is nearly impossible.
http://docs.xojo.com/Resources:Deprecations does not say a word (!) about RTF.
My question is double: what is the RTF status in both Microsoft AND Xojo. In short, deprecated by Microsoft and no more supported by Xojo (will never be updated no bug removal will be done) is an answer.
In short: “do not waste your time with that feature”.