patch 8.2.2465: using freed memory in :psearch Commit: https://github.com/vim/vim/commit/92bb83e41ca42d0d00d21753810d92485c808a50 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Feb 3 23:04:46 2021 +0100 patch 8.2.2465: using freed memory in :psearch Problem: Using freed memory in :psearch. (houyunsong) Solution: Check the current window is still valid. Fix flaky test.

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