bug#39782: 28.0.50; gnus-icalendar does not understand multiple repeating days

[Mattias Engdegård]

gnus-icalendar-tests.el contains backslash-comma sequences in string literals:

DESCRIPTION:In this meeting\, we will cover topics from product and enginee

and so on. The backslashes need to be doubled in order to be effective. 
(Presumably those in string comparisons should be removed.)

However, the tests pass in their present form. Does that mean that the iCal 
parser is not following RFC-5545 properly? It does mention that commas must be 
escaped so that they are not treated as separators (3.3.11), but I haven't read 
that RFC in its entirety.