support using object variables in t-esc

tests/qweb.test.ts

@@ -410,14 +410,11 @@ describe("attributes", () => {
     expect(result).toBe('<div><span class="def"></span></div>');
   });
 
-  test.skip("from object variables set previously", () => {
-    // qweb is stupid and does not support this.
-    // To do that properly, we need to extend the formatExpression method to
-    // be able to deal with objects.  I think that it is not easy:
-    // it should properly deal with stuff like {a:expr, b: {c: otherexpr}}
+  test("from object variables set previously", () => {
+    // Note: standard qweb does not allow this...
     qweb.addTemplate(
       "test",
-      `<div t-debug="1"><t t-set="o" t-value="{a:'b'}"/><span t-att-class="o.a"/></div>`
+      `<div><t t-set="o" t-value="{a:'b'}"/><span t-att-class="o.a"/></div>`
     );
     const result = renderToString(qweb, "test");
     expect(result).toBe('<div><span class="b"></span></div>');