neovim: \q doesn't open quickfix window

[strager]

[strager]

When the bug happens, getbufinfo claims that the quickfix buffer is hidden:

[{'lnum': 1, 'bufnr': 38, 'variables': {'did_ftplugin': 1, 'undo_ftplugin': 'set stl<', 'changedtick': 11
1, 'current_syntax': 'qf', 'editorconfig_tried': 1, 'ale_file_changed': 0, 'ale_quitting': 0, 'ale_origin
al_filetype': 'qf'}, 'name': '', 'changed': 0, 'lastused': 1656640374, 'loaded': 1, 'windows': [1088], 'h
idden': 1, 'listed': 1, 'changedtick': 111, 'linecount': 3}]

This confuses our strager#quickfix#is_quickfix_window_open function.

[strager]

^ the above comment was failing to close, not failing to open.

For failing to open, I think there's another bug (my fault):

1. open a tab
2. :copen
3. open another tab
4. \q

Because the quickfix list is open in another tab, \q doesn't open it in the current tab.