patch 8.0.0390: when the window scrolls the popup menu may be garbled commit https://github.com/vim/vim/commit/cb03642399ae4f3c47a006f608a6b912f9d98b5f Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 1 12:29:10 2017 +0100 patch 8.0.0390: when the window scrolls the popup menu may be garbled Problem: When the window scrolls horizontally when the popup menu is displayed part of it may not be cleared. (Neovim issue https://github.com/vim/vim/issues/6184) Solution: Remove the menu when the windows scrolled. (closes #1524)

Results of test83
case1: ok
case2: ok
case3: ok