patch 8.2.4599: GTK: get assertion errors when scrolling a split window Commit: https://github.com/vim/vim/commit/a4df834a92535cf124afd1c3b711b4a7109e3534 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 20 15:43:01 2022 +0000 patch 8.2.4599: GTK: get assertion errors when scrolling a split window Problem: GTK: get assertion errors when scrolling a split window. Solution: Use GDK_IS_DRAWABLE() on the scrollbar window. (closes https://github.com/vim/vim/issues/9982)