Modal: remove support for onFinished callback (#29852)

* Fix up type for `finished` result of Modal

The `finished` promise can be called with an empty array, for example if the
dialog is closed by a background click. This was not correctly represented in
the typing. Fix that, and add some documentation while we're at it.

* Type fixes to onFinished callbacks from Modal

These can all be called with zero arguments, despite what the type annotations
may say, so mark them accordingly.

* Remove uses of Modal `onFinished` property

... because it is confusing.

Instead, use the `finished` promise returned by `createDialog`.

* Modal: remove support for now-unused `onFinished` prop

* StopGapWidgetDriver: use `await` instead of promise chaining

* Fix up unit tests

test/unit-tests/components/views/settings/devices/deleteDevices-test.tsx

@@ -35,7 +35,7 @@ describe("deleteDevices()", () => {
         await deleteDevicesWithInteractiveAuth(mockClient, deviceIds, onFinished);
 
         expect(mockClient.deleteMultipleDevices).toHaveBeenCalledWith(deviceIds, undefined);
-        expect(onFinished).toHaveBeenCalledWith(true, undefined);
+        expect(onFinished).toHaveBeenCalledWith(true);
 
         // didnt open modal
         expect(modalSpy).not.toHaveBeenCalled();

test/unit-tests/components/views/settings/tabs/user/AccountUserSettingsTab-test.tsx

@@ -9,6 +9,7 @@ Please see LICENSE files in the repository root for full details.
 import { fireEvent, render, screen, within } from "jest-matrix-react";
 import React from "react";
 import { type MatrixClient, ThreepidMedium } from "matrix-js-sdk/src/matrix";
+import { defer } from "matrix-js-sdk/src/utils";
 import { logger } from "matrix-js-sdk/src/logger";
 import userEvent from "@testing-library/user-event";
 import { type MockedObject } from "jest-mock";
@@ -153,7 +154,8 @@ describe("<AccountUserSettingsTab />", () => {
                 (settingName) => settingName === UIFeature.Deactivate,
             );
 
-            const createDialogFn = jest.fn();
+            const finishedDeferred = defer<[boolean]>();
+            const createDialogFn = jest.fn().mockReturnValue({ finished: finishedDeferred.promise });
             jest.spyOn(Modal, "createDialog").mockImplementation(createDialogFn);
 
             render(getComponent());
@@ -167,14 +169,16 @@ describe("<AccountUserSettingsTab />", () => {
                 (settingName) => settingName === UIFeature.Deactivate,
             );
 
-            const createDialogFn = jest.fn();
+            const finishedDeferred = defer<[boolean]>();
+            const createDialogFn = jest.fn().mockReturnValue({ finished: finishedDeferred.promise });
             jest.spyOn(Modal, "createDialog").mockImplementation(createDialogFn);
 
             render(getComponent());
 
             await userEvent.click(screen.getByRole("button", { name: "Deactivate Account" }));
 
-            createDialogFn.mock.calls[0][1].onFinished(true);
+            finishedDeferred.resolve([true]);
+            await flushPromises();
 
             expect(defaultProps.closeSettingsFn).toHaveBeenCalled();
         });
@@ -183,14 +187,16 @@ describe("<AccountUserSettingsTab />", () => {
                 (settingName) => settingName === UIFeature.Deactivate,
             );
 
-            const createDialogFn = jest.fn();
+            const finishedDeferred = defer<[boolean]>();
+            const createDialogFn = jest.fn().mockReturnValue({ finished: finishedDeferred.promise });
             jest.spyOn(Modal, "createDialog").mockImplementation(createDialogFn);
 
             render(getComponent());
 
             await userEvent.click(screen.getByRole("button", { name: "Deactivate Account" }));
 
-            createDialogFn.mock.calls[0][1].onFinished(false);
+            finishedDeferred.resolve([false]);
+            await flushPromises();
 
             expect(defaultProps.closeSettingsFn).not.toHaveBeenCalled();
         });

test/unit-tests/components/views/settings/tabs/user/EncryptionUserSettingsTab-test.tsx

@@ -62,7 +62,7 @@ describe("<EncryptionUserSettingsTab />", () => {
         );
         expect(asFragment()).toMatchSnapshot();
 
-        const spy = jest.spyOn(Modal, "createDialog").mockReturnValue({} as any);
+        const spy = jest.spyOn(Modal, "createDialog").mockReturnValue({ finished: new Promise(() => {}) } as any);
         await user.click(screen.getByText("Verify this device"));
         expect(spy).toHaveBeenCalled();
     });

test/unit-tests/components/views/settings/tabs/user/SessionManagerTab-test.tsx

@@ -631,9 +631,10 @@ describe("<SessionManagerTab />", () => {
             // click verify button from current session section
             fireEvent.click(getByTestId(`verification-status-button-${alicesMobileDevice.device_id}`));
 
-            const { onFinished: modalOnFinished } = modalSpy.mock.calls[0][1] as any;
-            // simulate modal completing process
-            await modalOnFinished();
+            // close the modal
+            const { close: closeModal } = modalSpy.mock.results[0].value;
+            closeModal();
+            await flushPromises();
 
             // cancelled in case it was a failure exit from modal
             expect(mockVerificationRequest.cancel).toHaveBeenCalled();