Control: severity -1 wishlist This needs compiling against libncurses(w)6 which is not available in Debian yet. The libncursesw5 you are using from testing is currently compiled with --with-abi-version=5.
So mouse wheel scrolling at ABI level 6 is not intended to work in Debian yet. Bugs #230990 and #788610 have details on the issues with libncurses and the symbol versioning.
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