patch 8.0.0282: need to use CTRL-O twice when in Visual-Insert mode

Problem:    When doing a Visual selection and using "I" to go to insert mode,
            CTRL-O needs to be used twice to go to Normal mode. (Coacher)
Solution:   Check for the return value of edit(). (Christian Brabandt,
            closes #1290)
diff --git a/src/normal.c b/src/normal.c
index 2b867bb..7bae34e 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -2041,6 +2041,8 @@
 
 		if (restart_edit == 0)
 		    restart_edit = restart_edit_save;
+		else
+		    cap->retval |= CA_COMMAND_BUSY;
 	    }
 #else
 	    vim_beep(BO_OPER);