vim-patch:8.1.2046: SafeState may be triggered at the wrong moment

Problem:    SafeState may be triggered at the wrong moment.
Solution:   Move it up higher to after where messages are processed.  Add a
            SafeStateAgain event to tigger there.

69198cb8c0

SafeStateAgain is N/A.
Move SafeState functions to state.c.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/getchar.c

@@ -885,6 +885,7 @@ int ins_typebuf(char *str, int noremap, int offset, bool nottyped, bool silent)
   if (++typebuf.tb_change_cnt == 0) {
     typebuf.tb_change_cnt = 1;
   }
+  state_no_longer_safe();
 
   addlen = (int)strlen(str);
 
@@ -1625,6 +1626,12 @@ int vgetc(void)
   // Execute Lua on_key callbacks.
   nlua_execute_on_key(c);
 
+  // Need to process the character before we know it's safe to do something
+  // else.
+  if (c != K_IGNORE) {
+    state_no_longer_safe();
+  }
+
   return c;
 }