patch 8.1.2385: opening cmdline window with feedkeys() does not work

Problem:    Opening cmdline window with feedkeys() does not work. (Yegappan
            Lakshmanan)
Solution:   Recognize K_CMDWIN also when ex_normal_busy is set.
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 25f409b..769dcb8 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -1361,7 +1361,8 @@
 #ifdef FEAT_CMDWIN
 	if (c == cedit_key || c == K_CMDWIN)
 	{
-	    if (ex_normal_busy == 0 && got_int == FALSE)
+	    // TODO: why is ex_normal_busy checked here?
+	    if ((c == K_CMDWIN || ex_normal_busy == 0) && got_int == FALSE)
 	    {
 		/*
 		 * Open a window to edit the command line (and history).