Can check if the current window is the first one.

Closes #1070

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/theia/core/browser-window-module.ts

@@ -0,0 +1,10 @@
+import { DefaultWindowService as TheiaDefaultWindowService } from '@theia/core/lib/browser/window/default-window-service';
+import { ContainerModule } from '@theia/core/shared/inversify';
+import { DefaultWindowService } from './default-window-service';
+import { WindowServiceExt } from './window-service-ext';
+
+export default new ContainerModule((bind, unbind, isBound, rebind) => {
+  bind(DefaultWindowService).toSelf().inSingletonScope();
+  rebind(TheiaDefaultWindowService).toService(DefaultWindowService);
+  bind(WindowServiceExt).toService(DefaultWindowService);
+});

arduino-ide-extension/src/browser/theia/core/default-window-service.ts

@@ -0,0 +1,17 @@
+import { DefaultWindowService as TheiaDefaultWindowService } from '@theia/core/lib/browser/window/default-window-service';
+import { injectable } from '@theia/core/shared/inversify';
+import { WindowServiceExt } from './window-service-ext';
+
+@injectable()
+export class DefaultWindowService
+  extends TheiaDefaultWindowService
+  implements WindowServiceExt
+{
+  /**
+   * The default implementation always resolves to `true`.
+   * IDE2 does not use it. It's currently an electron-only app.
+   */
+  async isFirstWindow(): Promise<boolean> {
+    return true;
+  }
+}

arduino-ide-extension/src/browser/theia/core/window-service-ext.ts

@@ -0,0 +1,7 @@
+export const WindowServiceExt = Symbol('WindowServiceExt');
+export interface WindowServiceExt {
+  /**
+   * Returns with a promise that resolves to `true` if the current window is the first window.
+   */
+  isFirstWindow(): Promise<boolean>;
+}