Remove WindowManager, separate functionality into smaller modules (#2682)

* Move sendToRenderer to respective singletons

* Move to using ViewManager call for getting view by webContentsId

* Move show and create logic to main window, handle deep linking seperately

* Move resizing logic and event handing to mainWindow

* Move server switching logic to main/app

* Move tab switching logic to main/app, rely on showById for most usage

* Migrate remaining functions, remove windowManager objects, set up imports for self-contained singletons

* Fix E2E tests

* Update src/main/app/servers.ts

Co-authored-by: Elias Nahum <nahumhbl@gmail.com>

---------

Co-authored-by: Elias Nahum <nahumhbl@gmail.com>

src/main/windows/mainWindow.test.js

@@ -36,6 +36,7 @@ jest.mock('electron', () => ({
     BrowserWindow: jest.fn(),
     ipcMain: {
         handle: jest.fn(),
+        on: jest.fn(),
     },
     screen: {
         getDisplayMatching: jest.fn(),
@@ -469,6 +470,39 @@ describe('main/windows/mainWindow', () => {
         });
     });
 
+    describe('show', () => {
+        const mainWindow = new MainWindow();
+        mainWindow.win = {
+            visible: false,
+            isVisible: () => mainWindow.visible,
+            show: jest.fn(),
+            focus: jest.fn(),
+            on: jest.fn(),
+            once: jest.fn(),
+            webContents: {
+                setWindowOpenHandler: jest.fn(),
+            },
+        };
+
+        beforeEach(() => {
+            mainWindow.win.show.mockImplementation(() => {
+                mainWindow.visible = true;
+            });
+        });
+
+        afterEach(() => {
+            jest.resetAllMocks();
+        });
+
+        it('should show main window if it exists and focus it if it is already visible', () => {
+            mainWindow.show();
+            expect(mainWindow.win.show).toHaveBeenCalled();
+
+            mainWindow.show();
+            expect(mainWindow.win.focus).toHaveBeenCalled();
+        });
+    });
+
     describe('onUnresponsive', () => {
         const mainWindow = new MainWindow();