Revert "Check changes for focus event, improves #638"

It's because it additionally changes cursor to vertical bar.
I need to disable this behavior and make it compatible with
plugins that enable vertical cursor...

This reverts commit 44e79fc935.

plugin/polyglot.vim

@@ -13,22 +13,6 @@ if exists('g:loaded_sensible')
   finish
 endif
 
-if !has('gui_running') && (!has('nvim') || $TERM =~? '^rxvt')
-  let g:focau = extend({
-    \ 'auto': 1,
-    \ 'active': 1,
-    \ 'events' : {'<F25>': "\e[I", '<F26>': "\e[O"},
-    \ 'focuses': ["\e[?1004h", "\e[?1004l"],
-    \ 'screens': ["\e[?1049h", "\e[?1049l"],
-    \ 'cursors': ['', '', ''],
-    \ 'colors' : ['white', 'cyan'],
-    \ 'widgets': [],
-    \ 'clipregs':['+"p', '"+'],
-    \}, get(g:, 'focau', {}))
-
-  call focau#init#main()
-endif
-
 " Code taken from https://github.com/tpope/vim-sensible
 " and (mostly comments) from https://github.com/sheerun/vimrc
 "
@@ -90,7 +74,7 @@ if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'sensible') == -
   if match(capture, 'checktime') == -1
     augroup polyglot-sensible
       au!
-      au CursorHold,FocusGained * silent! checktime
+      au CursorHold * silent! checktime
     augroup END
   endif