[FIX] qweb: fix crash with ref an component in same slot

tests/components/__snapshots__/refs.test.ts.snap

@@ -41,7 +41,7 @@ exports[`refs refs are properly bound in slots 2`] = `
   let block1 = createBlock(\`<div><span class=\\"counter\\"><block-text-0/></span><block-child-0/></div>\`);
   let block2 = createBlock(\`<button block-handler-0=\\"click\\" block-ref=\\"1\\">do something</button>\`);
   
-  const slot3 = ctx => node => {
+  const slot3 = ctx => (node, key) => {
     const refs = ctx.__owl__.refs
     let d2 = [ctx, 'doSomething'];
     let d3 = (el) => refs[\`myButton\`] = el;

tests/components/__snapshots__/slots.test.ts.snap

@@ -43,6 +43,42 @@ exports[`slots can define and call slots 2`] = `
 }"
 `;
 
+exports[`slots can render node with t-ref and Component in same slot 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    return callSlot(ctx, node, key, 'default');
+  }
+}"
+`;
+
+exports[`slots can render node with t-ref and Component in same slot 2`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber } = helpers;
+  let assign = Object.assign;
+  
+  let block2 = createBlock(\`<div block-ref=\\"0\\"/>\`);
+  
+  const slot2 = ctx => (node, key) => {
+    const refs = ctx.__owl__.refs
+    let d1 = (el) => refs[\`div\`] = el;
+    let b2 = block2([d1]);
+    let b3 = component(\`Child\`, {}, key + \`__3\`, node, ctx);
+    return multi([b2, b3]);
+  }
+  
+  return function template(ctx, node, key = \\"\\") {
+    const refs = ctx.__owl__.refs;
+    return assign(component(\`Child\`, {}, key + \`__1\`, node, ctx), {slots: {'default': slot2(ctx)}});
+  }
+}"
+`;
+
 exports[`slots can render only empty slot 1`] = `
 "function anonymous(bdom, helpers
 ) {

tests/components/slots.test.ts

@@ -1347,4 +1347,22 @@ describe("slots", () => {
     expect(error).toBeNull();
     expect(fixture.innerHTML).toEqual("");
   });
+
+  test("can render node with t-ref and Component in same slot", async () => {
+    class Child extends Component {
+      static template = xml`<t t-slot="default"/>`;
+    }
+
+    class Parent extends Component {
+      static template = xml`<Child><div t-ref="div"/><Child/></Child>`;
+      static components = { Child };
+    }
+    let error = null;
+    try {
+      await mount(Parent, fixture);
+    } catch (e) {
+      error = e;
+    }
+    expect(error).toBeNull();
+  });
 });