patch 8.1.2020: it is not easy to change the window layout Commit: https://github.com/vim/vim/commit/d20dcb3d011da6111153109f6e46fbd5c7fe9fb6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Sep 10 21:22:58 2019 +0200 patch 8.1.2020: it is not easy to change the window layout Problem: It is not easy to change the window layout. Solution: Add win_splitmove(). (Andy Massimino, closes https://github.com/vim/vim/issues/4561)