Once 'timeoutlen' passes after a lone <C-w>, nvim runs its builtin window
command, which reads the next key without mappings, so the vscode window
mappings were skipped (e.g. <C-w>c closed the nvim window instead of the
editor).
Map a lone <C-w> to read the next key and feed the whole command again,
with its count, remapped when one of the window mappings handles it
(special keys like <C-w><C-Down> included).
Fixes#2466
dualfroz
upstream