fix(desktop): stop the updater button flickering after download (#2089)

fluxer_app/src/features/updater/state/UpdaterStateMachine.test.ts

@@ -45,6 +45,36 @@ describe('updaterStateMachine', () => {
 		expect(snapshot.context.updateInfo.web.available).toBe(false);
 	});
 
+	it('keeps a downloaded native update pending restart when checks re-emit available or not-available', () => {
+		let snapshot = createUpdaterMachineSnapshot();
+		snapshot = transition(snapshot, {
+			type: 'native.available',
+			version: '2.0.0',
+			downloadSize: 1000,
+			downloadStarted: true,
+			downloadUrl: null,
+			downloadOptions: [],
+		});
+		snapshot = transition(snapshot, {type: 'native.downloaded', version: '2.0.0'});
+		expect(snapshot.context.updateInfo.native.downloaded).toBe(true);
+
+		snapshot = transition(snapshot, {type: 'native.notAvailable', now: NOW});
+		expect(snapshot.context.updateInfo.native.downloaded).toBe(true);
+		expect(snapshot.context.updateInfo.native.available).toBe(true);
+
+		snapshot = transition(snapshot, {
+			type: 'native.available',
+			version: null,
+			downloadSize: null,
+			downloadStarted: true,
+			downloadUrl: null,
+			downloadOptions: [],
+		});
+		expect(snapshot.context.updateInfo.native.downloaded).toBe(true);
+		expect(snapshot.context.updateInfo.native.downloading).toBe(false);
+		expect(snapshot.context.updateInfo.native.version).toBe('2.0.0');
+	});
+
 	it('tracks check start and finish separately from available updates', () => {
 		let snapshot = createUpdaterMachineSnapshot();
 		snapshot = transition(snapshot, {type: 'check.started'});

fluxer_app/src/features/updater/state/UpdaterStateMachine.ts

@@ -166,6 +166,13 @@ export const updaterStateMachine = setup({
 		}),
 		applyNativeAvailable: assign(({context, event}) => {
 			if (event.type !== 'native.available') return {};
+			const currentNative = context.updateInfo.native;
+			if (currentNative.downloaded && (event.version == null || event.version === currentNative.version)) {
+				return {
+					isChecking: false,
+					nativeUnsupported: null,
+				};
+			}
 			return {
 				updateInfo: {
 					...context.updateInfo,