patch 8.2.0274: hang with combination of feedkeys(), Ex mode and :global

Problem:    Hang with combination of feedkeys(), Ex mode and :global.
            (Yegappan Lakshmanan)
Solution:   Add the pending_exmode_active flag.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index a819f64..b78e5ac 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -6185,9 +6185,11 @@
 		hold_gui_events = 0;
 #endif
 		must_redraw = CLEAR;
+		pending_exmode_active = TRUE;
 
 		main_loop(FALSE, TRUE);
 
+		pending_exmode_active = FALSE;
 		RedrawingDisabled = rd;
 		no_wait_return = nwr;
 		msg_scroll = ms;