scala 2.12 (https://bugs.debian.org/1149686) replaces scala 2.11 in
unstable. Its scala-library Breaks the 2.11 build of latexdraw, so
latexdraw needs a rebuild against Scala 2.12 and
scala-parser-combinators-2.12 (https://bugs.debian.org/1139718).

The fix is in https://salsa.debian.org/java-team/latexdraw/-/merge_requests/3.
Upload it after scala 2.12 and scala-parser-combinators-2.12 reach
unstable.