# HG changeset patch
# User Rik <rik@octave.org>
# Date 1576017489 28800
# Node ID f78dc0d6ad2d2cb91dce5e3add0dacda8ae95a59
# Parent  8c1cb06468dbb2b1c3c7355c492af2ce854b71a5
Stop error in stem callback function (bug #57391).

* __stem__.m (update_xlim): Check whether hggroup is "beingdeleted" before
accessing "baseline" value from it.

diff -r 8c1cb06468db -r f78dc0d6ad2d scripts/plot/draw/private/__stem__.m
--- a/scripts/plot/draw/private/__stem__.m	Tue Dec 10 23:13:14 2019 +0100
+++ b/scripts/plot/draw/private/__stem__.m	Tue Dec 10 14:38:09 2019 -0800
@@ -362,7 +362,8 @@
 
   for i = 1 : length (kids)
     obj = get (kids(i));
-    if (strcmp (obj.type, "hggroup") && isfield (obj, "baseline"))
+    if (strcmp (obj.type, "hggroup") && isfield (obj, "baseline")
+        && ! strcmp (obj.beingdeleted, "on"))
       if (any (get (obj.baseline, "xdata") != xlim))
         set (obj.baseline, "xdata", xlim);
       endif