fix(window): keep window commands typed after timeoutlen in vscode

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

runtime/vscode/overrides/vscode-window-commands.vim

@@ -34,6 +34,14 @@ function! s:manageEditorWidth(...)
     endfor
 endfunction
 
+" A lone <C-w> runs the builtin window command once 'timeoutlen' passes, and that reads the next key
+" without mappings, skipping the ones below. Read the key here instead and feed the whole command
+" again, remapped when one of them handles it.
+function! s:windowCommand(mode) abort
+    let keys = "\<C-w>" . getcharstr()
+    call feedkeys((v:count ? v:count : '') . keys, (empty(maparg(keytrans(keys), a:mode)) ? 'n' : 'm') . 'i')
+endfunction
+
 command! -complete=file -nargs=? Split call <SID>split('h', <q-args>)
 command! -complete=file -nargs=? Vsplit call <SID>split('v', <q-args>)
 command! -complete=file -nargs=? New call <SID>split('h', '__vscode_new__')
@@ -46,6 +54,9 @@ AlterCommand new New
 AlterCommand vne[w] Vnew
 AlterCommand on[ly] Only
 
+nnoremap <C-w> <Cmd>call <SID>windowCommand('n')<CR>
+xnoremap <C-w> <Cmd>call <SID>windowCommand('x')<CR>
+
 " buffer management
 nnoremap <C-w>n <Cmd>call <SID>splitNew('h', '__vscode_new__')<CR>
 xnoremap <C-w>n <Cmd>call <SID>splitNew('h', '__vscode_new__')<CR>