Make sure that Use elements are redrawn for each new parent

- fixes text-text-12-t.svg

Source/Document Structure/SvgUse.cs

@@ -80,6 +80,9 @@ namespace Svg
                 {
                     var origParent = element.Parent;
                     element._parent = this;
+                    // as the new parent may have other styles that are inherited,
+                    // we have to redraw the paths for the children
+                    element.InvalidateChildPaths();
                     element.RenderElement(renderer);
                     element._parent = origParent;
                 }

Source/SvgElementStyle.cs

@@ -26,6 +26,18 @@ namespace Svg
             set { this._dirty = value; }
         }
 
+        /// <summary>
+        /// Force recreation of the paths for the element and it's children.
+        /// </summary>
+        public void InvalidateChildPaths()
+        {
+            this.IsPathDirty = true;
+            foreach (SvgElement element in this.Children)
+            {
+                element.InvalidateChildPaths();
+            }
+        }
+
         protected static float FixOpacityValue(float value)
         {
             const float max = 1.0f;

Tests/W3CTestSuite/PassingTests.txt

@@ -163,6 +163,7 @@ text-text-08-b.svg
 text-text-09-t.svg
 text-text-10-t.svg
 text-text-11-t.svg
+text-text-12-t.svg
 text-tref-01-b.svg
 text-tspan-01-b.svg
 text-ws-01-t.svg