ATL-667: Warn the user when could not save sketch.

- Log the PID of the backend process.
 - Aligned the dev startup mode with the production: `--no-cluster`.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

arduino-ide-extension/src/browser/theia/core/application-shell.ts

@@ -2,7 +2,9 @@
 import { injectable, inject } from 'inversify';
 import { EditorWidget } from '@theia/editor/lib/browser';
 import { CommandService } from '@theia/core/lib/common/command';
+import { MessageService } from '@theia/core/lib/common/message-service';
 import { OutputWidget } from '@theia/output/lib/browser/output-widget';
+import { ConnectionStatusService, ConnectionStatus } from '@theia/core/lib/browser/connection-status-service';
 import { ApplicationShell as TheiaApplicationShell, Widget } from '@theia/core/lib/browser';
 import { Sketch } from '../../../common/protocol';
 import { EditorMode } from '../../editor-mode';
@@ -18,9 +20,15 @@ export class ApplicationShell extends TheiaApplicationShell {
     @inject(CommandService)
     protected readonly commandService: CommandService;
 
+    @inject(MessageService)
+    protected readonly messageService: MessageService;
+
     @inject(SketchesServiceClientImpl)
     protected readonly sketchesServiceClient: SketchesServiceClientImpl;
 
+    @inject(ConnectionStatusService)
+    protected readonly connectionStatusService: ConnectionStatusService;
+
     protected track(widget: Widget): void {
         super.track(widget);
         if (widget instanceof OutputWidget) {
@@ -60,6 +68,10 @@ export class ApplicationShell extends TheiaApplicationShell {
     }
 
     async saveAll(): Promise<void> {
+        if (this.connectionStatusService.currentStatus === ConnectionStatus.OFFLINE) {
+            this.messageService.error('Could not save the sketch. Please copy your unsaved work into your favorite text editor, and restart the IDE.');
+            return; // Theia does not reject on failed save: https://github.com/eclipse-theia/theia/pull/8803
+        }
         await super.saveAll();
         const options = { execOnlyIfTemp: true, openAfterMove: true };
         await this.commandService.executeCommand(SaveAsSketch.Commands.SAVE_AS_SKETCH.id, options);