[FIX] reactivity: only show key in subscription if observed by callback

Previously, the getSubscriptions debugging utility returned all observed
keys for a given target, instead of only the keys observed by the
callback it received as argument. This commit fixes that issues.

src/runtime/reactivity.ts

@@ -162,10 +162,15 @@ export function getSubscriptions(callback: Callback) {
   const targets = callbacksToTargets.get(callback) || [];
   return [...targets].map((target) => {
     const keysToCallbacks = targetToKeysToCallbacks.get(target);
-    return {
+    let keys = [];
-      target,
+    if (keysToCallbacks) {
-      keys: keysToCallbacks ? [...keysToCallbacks.keys()] : [],
+      for (const [key, cbs] of keysToCallbacks) {
-    };
+        if (cbs.has(callback)) {
+          keys.push(key);
+        }
+      }
+    }
+    return { target, keys };
   });
 }
 // Maps reactive objects to the underlying target

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

@@ -140,3 +140,39 @@ exports[`reactivity in lifecycle state changes in willUnmount do not trigger rer
   }
 }"
 `;
+
+exports[`subscriptions subscriptions returns the keys and targets observed by the component 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  return function template(ctx, node, key = \\"\\") {
+    return text(ctx['state'].a);
+  }
+}"
+`;
+
+exports[`subscriptions subscriptions returns the keys observed by the component 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, false);
+  
+  return function template(ctx, node, key = \\"\\") {
+    const b2 = text(ctx['state'].a);
+    const b3 = comp1({state: ctx['state']}, key + \`__1\`, node, this, null);
+    return multi([b2, b3]);
+  }
+}"
+`;
+
+exports[`subscriptions subscriptions returns the keys observed by the component 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  return function template(ctx, node, key = \\"\\") {
+    return text(ctx['props'].state.b);
+  }
+}"
+`;

tests/components/reactivity.test.ts

@@ -7,6 +7,7 @@ import {
   onWillUnmount,
   useState,
   xml,
+  toRaw,
 } from "../../src";
 import { makeTestFixture, nextTick, snapshotEverything, useLogLifecycle } from "../helpers";
 
@@ -232,3 +233,34 @@ describe("reactivity in lifecycle", () => {
     expect(fixture.innerHTML).toBe("34");
   });
 });
+
+describe("subscriptions", () => {
+  test("subscriptions returns the keys and targets observed by the component", async () => {
+    class Comp extends Component {
+      static template = xml`<t t-esc="state.a"/>`;
+      state = useState({ a: 1, b: 2 });
+    }
+    const comp = await mount(Comp, fixture);
+    expect(fixture.innerHTML).toBe("1");
+    expect(comp.__owl__.subscriptions).toEqual([{ keys: ["a"], target: toRaw(comp.state) }]);
+  });
+
+  test("subscriptions returns the keys observed by the component", async () => {
+    class Child extends Component {
+      static template = xml`<t t-esc="props.state.b"/>`;
+      setup() {
+        child = this;
+      }
+    }
+    let child: Child;
+    class Parent extends Component {
+      static template = xml`<t t-esc="state.a"/><Child state="state"/>`;
+      static components = { Child };
+      state = useState({ a: 1, b: 2 });
+    }
+    const parent = await mount(Parent, fixture);
+    expect(fixture.innerHTML).toBe("12");
+    expect(parent.__owl__.subscriptions).toEqual([{ keys: ["a"], target: toRaw(parent.state) }]);
+    expect(child!.__owl__.subscriptions).toEqual([{ keys: ["b"], target: toRaw(parent.state) }]);
+  });
+});