commit https://github.com/vim/vim/commit/294a7e55b01149154807a23323038784549b8946 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Nov 22 19:39:38 2015 +0100 patch 7.4.936 Problem: Crash when dragging with the mouse. Solution: Add safety check for NULL pointer. Check mouse position for valid value. (Hirohito Higashi)