[NTG-context] typing+framedtext: different behaviour between TL2017 and 2019

[Tomas Hala]

# # This should fix it:
# # \setupstartstop
# #   [DefaultSnippet]
# #   [before=,
# #    after=,
# #    style=]
# # Wolfgang
# 
# Unfortunately not, I tried it in preamble (with no effect)
# as well as after the \starttext (with no effect + text of parameters were pushed to the document).

Your code works, thank you for the help.

The no-effect-problem was caused by some invisible characters (0xc2a0)
inside, they disrupted the token processing.
 
Tomáš