patch 8.0.1848: 'termwinscroll' does not work properly commit https://github.com/vim/vim/commit/4d6cd291cec668b991f2b43d76c6feab8b2e7d98 Author: Bram Moolenaar <Bram@vim.org> Date: Tue May 15 23:53:26 2018 +0200 patch 8.0.1848: 'termwinscroll' does not work properly Problem: 'termwinscroll' does not work properly. (Dominique Pelle) Solution: Subtract removed scrollback from the scrollback count. Add a test for 'termwinscroll'. (closes #2909)

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