right and negative margin

src/Layout.js

@@ -484,7 +484,8 @@ var computeLayout = (function() {
         if (!leadingPos && trailingPos) {
           child.layout[pos[crossAxis]] =
             node.layout[dim[crossAxis]] -
-            getDimWithMargin(child, crossAxis) -
+            child.layout[dim[crossAxis]] -
+            getMargin(child, trailing[crossAxis]) -
             getPosition(child, trailing[crossAxis]);
         }
       } else {

src/__tests__/Layout-test.js

@@ -917,6 +917,17 @@ describe('Layout', function() {
     );
   });
 
+  it('should layout with position absolute right and negative margin', function() {
+    testLayout(
+      {style: {}, children: [
+        {style: {right: 20, marginLeft: 5, marginRight: -5, width: 5, position: 'absolute'}}
+      ]},
+      {width: 0, height: 0, top: 0, left: 0, children: [
+        {width: 5, height: 0, top: 0, left: -20}
+      ]}
+    );
+  });
+
   xit('should layout text with alignItems: stretch', function() {
     testLayout(
       {style: {width: 80, padding: 7, alignItems: 'stretch', measure: text('loooooooooong with space')}},