patch 8.2.2236: 'scroll' option can change when setting the statusline

Problem:    'scroll' option can change when setting the statusline or tabline
            but the option context is not updated.
Solution:   Update the script context when the scroll option is changed as a
            side effect. (Christian Brabandt, closes #7533)
diff --git a/src/scriptfile.c b/src/scriptfile.c
index 90d483b..a9b3825 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -1553,6 +1553,7 @@
 
 /*
  * Get a pointer to a script name.  Used for ":verbose set".
+ * Message appended to "Last set from "
  */
     char_u *
 get_scriptname(scid_T id)
@@ -1567,6 +1568,8 @@
 	return (char_u *)_("environment variable");
     if (id == SID_ERROR)
 	return (char_u *)_("error handler");
+    if (id == SID_WINLAYOUT)
+	return (char_u *)_("changed window size");
     return SCRIPT_ITEM(id)->sn_name;
 }