Add sortLabel as override when applicable

Author: joachimnielandt

schemas/config-editor.xsd

@@ -2331,6 +2331,11 @@ This can allow to build dynamic snippet based on the current record.
           <xs:documentation>Snippet label.</xs:documentation>
         </xs:annotation>
       </xs:attribute>
+      <xs:attribute name="sortLabel" type="xs:string" use="optional">
+        <xs:annotation>
+          <xs:documentation>When defined, @sortLabel should be used instead of @label for sorting purposes. Handy for putting values at the start of end of a list, for example.</xs:documentation>
+        </xs:annotation>
+      </xs:attribute>
     </xs:complexType>
   </xs:element>
   <xs:element name="batchEditing">

web/src/main/webapp/xslt/ui-metadata/form-builder.xsl

@@ -602,9 +602,10 @@
                     </xsl:if>
                   </button>
                   <xsl:if test="$hasMultipleChoice">
-                    <!-- A combo with the list of snippet available -->
+                    <!-- A combo with the list of snippets available -->
                     <ul class="dropdown-menu">
                       <xsl:for-each select="$snippets">
+                        <xsl:sort select="if(current()/@sortLabel != '') then current()/@sortLabel else (if ($strings/*[name() = current()/@label] != '') then $strings/*[name() = current()/@label] else current()/@label)"/>
                         <xsl:variable name="label" select="@label"/>
                         <li><a id="{concat($id, $label)}">
                           <xsl:value-of select="if ($strings/*[name() = $label] != '') then $strings/*[name() = $label] else $label"/>