patch 8.1.1537: using "tab" for popup window can be confusing commit https://github.com/vim/vim/commit/fc06cbbf8601a453b4a62a17558821add09f863f Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jun 15 14:14:31 2019 +0200 patch 8.1.1537: using "tab" for popup window can be confusing Problem: Using "tab" for popup window can be confusing. Solution: Use "tabpage". (Hirohito Higashi, closes https://github.com/vim/vim/issues/4532)