[FIX] ChartJs: Properly destroy chartJs object on component wrapper d…

…eletion

How to reproduce:

- Make a chartjs chart (line/bar/pie)
- Mousedown on a datapoint/bar/part of the pie
- move your mouse
- mouseup (lift your finger) while still moving your mouse
-> crash

We were not properly destroying the chart js item and their linked
eventListeners persisted. Specifically, the eventHandler of the tooltip
plugin would still try to handle the mousemove event while its internal
state was partially invalidated.

closes #4137

Task: 3777754
Signed-off-by: Lucas Lefèvre (lul) <lul@odoo.com>

src/components/figures/chart/chartJs/chartjs.ts

@@ -1,4 +1,4 @@
-import { Component, onMounted, useEffect, useRef } from "@odoo/owl";
+import { Component, onMounted, onWillUnmount, useEffect, useRef } from "@odoo/owl";
 import type { Chart, ChartConfiguration } from "chart.js";
 import { deepCopy, deepEquals } from "../../../../helpers";
 import { Figure, SpreadsheetChildEnv } from "../../../../types";
@@ -42,6 +42,7 @@ export class ChartJsComponent extends Component<Props, SpreadsheetChildEnv> {
       // Note: chartJS modify the runtime in place, so it's important to give it a copy
       this.createChart(deepCopy(runtime.chartJsConfig));
     });
+    onWillUnmount(() => this.chart?.destroy());
     useEffect(() => {
       const runtime = this.chartRuntime;
       if (!deepEquals(runtime, this.currentRuntime, "ignoreFunctions")) {

tests/figures/chart/charts_component.test.ts

@@ -1224,3 +1224,13 @@ describe("Default background on runtime tests", () => {
     expect(model.getters.getChartRuntime("1").background).toBe("#FA0000");
   });
 });
+
+test("ChartJS charts are correctly destroyed on chart deletion", async () => {
+  ({ parent, fixture, model } = await mountSpreadsheet({ model: new Model() }));
+  createChart(model, { dataSets: ["A1"], type: "bar" }, "1");
+  await nextTick();
+  const spyDelete = jest.spyOn((window as any).Chart.prototype, "destroy");
+  model.dispatch("DELETE_FIGURE", { id: "1", sheetId: model.getters.getActiveSheetId() });
+  await nextTick();
+  expect(spyDelete).toHaveBeenCalled();
+});

tests/test_helpers/helpers.ts

@@ -624,7 +624,7 @@ export const mockChart = () => {
       return mockChartData.data;
     }
     toBase64Image = () => "";
-    destroy = () => {};
+    destroy() {}
     update() {}
     options = mockChartData.options;
     config = mockChartData;