RoomListViewModel: Add functionality to toggle message preview setting (#29511)

* Add setting for showing message previews

* Add hook to track and toggle message preview

* Use hook in view model

* Add tests

* Fix tests

* Fix lint

* Fix typo

test/unit-tests/components/viewmodels/roomlist/RoomListViewModel-test.tsx

@@ -218,4 +218,26 @@ describe("RoomListViewModel", () => {
             expect(vm.current.activeSortOption).toEqual(SortOption.AToZ);
         });
     });
+
+    describe("message preview toggle", () => {
+        it("should return shouldShowMessagePreview based on setting", () => {
+            jest.spyOn(SettingsStore, "getValue").mockImplementation(() => true);
+            mockAndCreateRooms();
+            const { result: vm } = renderHook(() => useRoomListViewModel());
+            expect(vm.current.shouldShowMessagePreview).toEqual(true);
+        });
+
+        it("should change setting on toggle", () => {
+            jest.spyOn(SettingsStore, "getValue").mockImplementation(() => true);
+            const fn = jest.spyOn(SettingsStore, "setValue").mockImplementation(async () => {});
+            mockAndCreateRooms();
+            const { result: vm } = renderHook(() => useRoomListViewModel());
+            expect(vm.current.shouldShowMessagePreview).toEqual(true);
+            act(() => {
+                vm.current.toggleMessagePreview();
+            });
+            expect(vm.current.shouldShowMessagePreview).toEqual(false);
+            expect(fn).toHaveBeenCalled();
+        });
+    });
 });

test/unit-tests/components/views/rooms/RoomListPanel/RoomList-test.tsx

@@ -35,6 +35,8 @@ describe("<RoomList />", () => {
             activeSecondaryFilter: SecondaryFilters.AllActivity,
             sort: jest.fn(),
             activeSortOption: SortOption.Activity,
+            shouldShowMessagePreview: false,
+            toggleMessagePreview: jest.fn(),
         };
 
         // Needed to render a room list cell

test/unit-tests/components/views/rooms/RoomListPanel/RoomListPrimaryFilters-test.tsx

@@ -28,6 +28,8 @@ describe("<RoomListPrimaryFilters />", () => {
             activeSecondaryFilter: SecondaryFilters.AllActivity,
             sort: jest.fn(),
             activeSortOption: SortOption.Activity,
+            shouldShowMessagePreview: false,
+            toggleMessagePreview: jest.fn(),
         };
     });