https://bugs.winehq.org/show_bug.cgi?id=45719
--- Comment #4 from Austin English austinenglish@gmail.com --- (In reply to Colin Finck from comment #3)
Any update on this? You said you are going to have a look, however this has already been 3 months now and the comctl32/tests/treeview.c still looks unchanged.
A patch was just sent: https://source.winehq.org/patches/data/156280