patch 8.1.2044: no easy way to process postponed work

Problem:    No easy way to process postponed work. (Paul Jolly)
Solution:   Add the SafeState autocommand event.
diff --git a/src/edit.c b/src/edit.c
index cc41d49..6714144 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -1509,6 +1509,11 @@
 					(linenr_T)(curwin->w_cursor.lnum + 1));
     }
 
+    // Trigger SafeState if nothing is pending.
+    may_trigger_safestate(ready
+	    && !ins_compl_active()
+	    && !pum_visible());
+
 #if defined(FEAT_CONCEAL)
     if ((conceal_update_lines
 	    && (conceal_old_cursor_line != conceal_new_cursor_line