patch 8.1.1645: cannot use a popup window for a balloon commit https://github.com/vim/vim/commit/b3d17a20d243f65bcfe23de08b7afd948c5132c2 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jul 7 18:28:14 2019 +0200 patch 8.1.1645: cannot use a popup window for a balloon Problem: Cannot use a popup window for a balloon. Solution: Add popup_beval(). Add the "mousemoved" property. Add the screenpos() function.