patch 9.0.1665: empty CmdlineEnter autocommand causes errors in Ex mode

Problem:    Empty CmdlineEnter autocommand causes errors in Ex mode.
Solution:   Save and restore ex_pressedreturn. (Christian Brabandt,
            closes # 12581, closes #12578)

Author: chrisbra

src/autocmd.c

@@ -2018,7 +2018,6 @@ apply_autocmds_group(
     int		did_save_redobuff = FALSE;
     save_redo_T	save_redo;
     int		save_KeyTyped = KeyTyped;
-    int		save_did_emsg;
     ESTACK_CHECK_DECLARATION;
 
     /*
@@ -2310,12 +2309,14 @@ apply_autocmds_group(
 	else
 	    check_lnums_nested(TRUE);
 
-	save_did_emsg = did_emsg;
+	int save_did_emsg = did_emsg;
+	int save_ex_pressedreturn = get_pressedreturn();
 
 	do_cmdline(NULL, getnextac, (void *)&patcmd,
 				     DOCMD_NOWAIT|DOCMD_VERBOSE|DOCMD_REPEAT);
 
 	did_emsg += save_did_emsg;
+	set_pressedreturn(save_ex_pressedreturn);
 
 	if (nesting == 1)
 	    // restore cursor and topline, unless they were changed

src/ex_docmd.c

@@ -9840,7 +9840,6 @@ is_loclist_cmd(int cmdidx)
 }
 #endif
 
-#if defined(FEAT_TIMERS) || defined(PROTO)
     int
 get_pressedreturn(void)
 {
@@ -9852,4 +9851,3 @@ set_pressedreturn(int val)
 {
      ex_pressedreturn = val;
 }
-#endif

src/testdir/test_ex_mode.vim

@@ -239,6 +239,12 @@ func Test_ex_mode_errors()
 
   au! CmdLineEnter
   delfunc ExEnterFunc
+
+  au CmdlineEnter * :
+  call feedkeys("gQecho 1\r", 'xt')
+
+  au! CmdlineEnter
+
   quit
 endfunc
 

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1665,
 /**/
     1664,
 /**/