patch 8.2.3759: quickfix buffer becomes hidden while still in a window Commit: https://github.com/vim/vim/commit/78a61068cf2c83e611d954a0fb413a09ad59dc07 Author: Yegappan Lakshmanan <yegappan@yahoo.com> Date: Wed Dec 8 20:03:31 2021 +0000 patch 8.2.3759: quickfix buffer becomes hidden while still in a window Problem: Quickfix buffer becomes hidden while still in a window. Solution: Check if the closed window is the last window showing the quickfix buffer. (Yegappan Lakshmanan, closes #9303, closes #9300)