dia.attributes: support calc() in transform attribute (#1509)

Author: kumilingus

docs/src/joint/api/dia/attributes/intro.html

@@ -113,8 +113,6 @@ <h5 class="calc-header">Notes:</h5>
 <p>It can be used with the following attributes:</p>
 
 <ul>
-
-
     <li>
         <a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/SVG/Element/rect">SVGRectElement</a>
         <ul>
@@ -194,6 +192,12 @@ <h5 class="calc-header">Notes:</h5>
             <li><a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/dy">dy</a></li>
         </ul>
     </li>
+    <li>
+        Any SVG element (e.g. <a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/SVG/Element/g">SVGGElement</a> )
+        <ul>
+            <li><a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform">transform</a></li>
+        </ul>
+    </li>
 </ul>
 
 <h5 class="calc-header">Examples:</h5>

src/dia/attributes/index.mjs

@@ -622,6 +622,7 @@ const attributesNS = {
 
 // Support `calc()` with the following SVG attributes
 [
+    'transform', // g
     'd', // path
     'points', // polyline / polygon
     'width', 'height', // rect / image