#714: UX improvements of the Arduino LS in IDE2

- Debounced the connectivity status update.
 - Silent the output channel for the Arduino LS.
 - Delay the problem markers update with 500ms.
 - Do not update the status bar on every `keypress` event.
 - Debounced the tab-bar toolbar updates when typing in editor.
 - Fixed electron menu contribution binding.
 - Aligned the editor widget factory's API to Theia.
 - Set the zoom level when the app is ready (Closes #1244)
 - Fixed event listener leak (Closes #1062)

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

arduino-ide-extension/src/browser/theia/core/connection-status-service.ts

@@ -13,6 +13,7 @@ import {
 import { ArduinoDaemon } from '../../../common/protocol';
 import { NotificationCenter } from '../../notification-center';
 import { nls } from '@theia/core/lib/common';
+import debounce = require('lodash.debounce');
 
 @injectable()
 export class FrontendConnectionStatusService extends TheiaFrontendConnectionStatusService {
@@ -36,10 +37,11 @@ export class FrontendConnectionStatusService extends TheiaFrontendConnectionStat
     this.notificationCenter.onDaemonDidStop(
       () => (this.connectedPort = undefined)
     );
-    this.wsConnectionProvider.onIncomingMessageActivity(() => {
+    const refresh = debounce(() => {
       this.updateStatus(!!this.connectedPort);
       this.schedulePing();
-    });
+    }, this.options.offlineTimeout - 10);
+    this.wsConnectionProvider.onIncomingMessageActivity(() => refresh());
   }
 }