I have decided to split the issue into smaller parts. I'm going to fix the JavaFX 11 "not found" issue by using the --add-modules option in mediathekview's wrapper script. I don't even have to patch the sources then. Another patch will ensure compatibility with the default-jdk version in Debian. For me MediathekView 13.0.6 works with Java 11 and OpenJFX 11 on Debian Buster.
The other problem is to package 13.2.1 and to make it work with Java 11 and JavaFX 11. I will file a separate wishlist bug report for that. Markus
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