patch 8.1.1945: popup window "firstline" cannot be reset Commit: https://github.com/vim/vim/commit/9e67b6a6a126f401417590dedf1bd38f71bfbae4 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 30 17:34:08 2019 +0200 patch 8.1.1945: popup window "firstline" cannot be reset Problem: Popup window "firstline" cannot be reset. Solution: Allow for setting "firstline" to zero. Fix that the text jumps to the top when using win_execute(). (closes #4876)

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