patch 8.0.1767: with 'incsearch' text may jump up and down commit https://github.com/vim/vim/commit/9d34d90210ba52ebaf45973282e5921f5af364c7 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Apr 27 22:18:12 2018 +0200 patch 8.0.1767: with 'incsearch' text may jump up and down Problem: With 'incsearch' text may jump up and down. () Solution: Besides w_botline also save and restore w_empty_rows. (closes # 2530)

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