Fix: smart quit should skip floating windows and popup (#3640)

@bug vim winnr('$') do not include popup
 ref: https://github.com/vim/vim/issues/6474

autoload/SpaceVim/api/vim/window.vim

@@ -59,6 +59,30 @@ else
   endfunction
 endif
 
+if has('nvim')
+  function! s:self.is_float(winnr) abort
+    let id = win_getid(a:winnr)
+    if id > 0
+      return has_key(nvim_win_get_config(id), 'col')
+    else
+      return 0
+    endif
+  endfunction
+else
+  function! s:self.is_float(winnr) abort
+    let id = win_getid(a:winnr)
+    if id > 0
+      try
+        return has_key(popup_getoptions(id), 'col')
+      catch /^Vim\%((\a\+)\)\=:E993/
+        return 0
+      endtry
+    else
+      return 0
+    endif
+  endfunction
+endif
+
 
 function! SpaceVim#api#vim#window#get() abort
   return deepcopy(s:self)

autoload/SpaceVim/mapping.vim

@@ -9,6 +9,7 @@
 scriptencoding utf-8
 
 let s:BUFFER = SpaceVim#api#import('vim#buffer')
+let s:WIN = SpaceVim#api#import('vim#window')
 
 
 let g:unite_source_menu_menus =
@@ -289,6 +290,8 @@ endfunction
 fu! SpaceVim#mapping#SmartClose() abort
   let ignorewin = get(g:,'spacevim_smartcloseignorewin',[])
   let ignoreft = get(g:, 'spacevim_smartcloseignoreft',[])
+  " @bug vim winnr('$') do not include popup
+  " ref: https://github.com/vim/vim/issues/6474
   let win_count = winnr('$')
   let num = win_count
   for i in range(1,win_count)
@@ -298,6 +301,8 @@ fu! SpaceVim#mapping#SmartClose() abort
       let num = num - 1
     elseif getwinvar(i, '&previewwindow') == 1 && winnr() !=# i
       let num = num - 1
+    elseif s:WIN.is_float(i)
+      let num = num - 1
     endif
   endfor
   if num == 1