Move the step for menulist-button before menulist

Since menulist-button depends on computedAppearance, but menulist does not, menulist-button needs to be checked first.

Author: zcorpan

css-ui-4/Overview.bs

@@ -2158,6 +2158,7 @@ The possible <dfn lt="kind of widget|kinds of widgets">kinds of widgets</dfn> ar
             If |element| <a>can be a textfield</a>, given |computedAppearance|, then return the
             <a>appropriate widget</a> with |authorProps| set to |authorProps|, |expected| set to
             [=kind of widget/textfield=], and |fallback| set to [=kind of widget/none=].
+	    <!-- textfield needs to come before searchfield -->
 
         <li>
             If |element| <a>can be a searchfield</a>, given |computedAppearance|, then return the
@@ -2181,13 +2182,14 @@ The possible <dfn lt="kind of widget|kinds of widgets">kinds of widgets</dfn> ar
             with |authorProps| set to |authorProps|, |expected| set to [=kind of widget/listbox=], and |fallback|
             set to [=kind of widget/none=].
 
-        <li>
-            If |element| <a>can be a menulist</a>, given |computedAppearance|, then return
-            [=kind of widget/menulist=].
-
         <li>
             If |element| <a>can be a menulist-button</a>, given |computedAppearance|, then return
             [=kind of widget/menulist-button=].
+	    <!-- menulist-button needs to come before menulist -->
+
+        <li>
+            If |element| <a>can be a menulist</a>, given |computedAppearance|, then return
+            [=kind of widget/menulist=].
 
         <li>
             If |element| <a>can be a textarea</a>, given |computedAppearance|, then return the <a>appropriate widget</a>