vim-patch:7.4.446

Problem:    In some situations, when setting up an environment to trigger an
	    autocommand, the environment is not properly restored.
Solution:   Check the return value of switch_win() and call restore_win()
	    always.  (Daniel Hahler)

https://code.google.com/p/vim/source/detail?r=v7-4-446

src/nvim/memory.c

@@ -489,7 +489,8 @@ void free_all_mem(void)
     return;
   entered = true;
 
-  block_autocmds();         /* don't want to trigger autocommands here */
+  // Don't want to trigger autocommands from here on.
+  block_autocmds();
 
   /* Close all tabs and windows.  Reset 'equalalways' to avoid redraws. */
   p_ea = FALSE;