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.

src/ex_getln.c

@@ -1361,7 +1361,8 @@ getcmdline_int(
 #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).

src/testdir/test_cmdline.vim

@@ -843,3 +843,8 @@ func Test_buffers_lastused()
   bwipeout bufb
   bwipeout bufc
 endfunc
+
+func Test_cmdwin_feedkeys()
+  " This should not generate E488
+  call feedkeys("q:\<CR>", 'x')
+endfunc

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2385,
 /**/
     2384,
 /**/