Fixed widget lookup to eliminate duplicate tabs.

- Removed `@theia/editor-preview`,
 - Patched opener options when repairing layout on start, and
 - Compare widget keys with deepEquals instead of string equal.

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

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

@@ -2,10 +2,13 @@ import { notEmpty } from '@theia/core';
 import { WidgetDescription } from '@theia/core/lib/browser';
 import { ShellLayoutRestorer as TheiaShellLayoutRestorer } from '@theia/core/lib/browser/shell/shell-layout-restorer';
 import { injectable } from '@theia/core/shared/inversify';
-import { EditorPreviewWidgetFactory } from '@theia/editor-preview/lib/browser/editor-preview-widget-factory';
 import { EditorWidgetFactory } from '@theia/editor/lib/browser/editor-widget-factory';
 import { FrontendApplication } from './frontend-application';
 
+namespace EditorPreviewWidgetFactory {
+  export const ID = 'editor-preview-widget'; // The factory ID must be a hard-coded string because IDE2 does not depend on `@theia/editor-preview`.
+}
+
 @injectable()
 export class ShellLayoutRestorer extends TheiaShellLayoutRestorer {
   override async restoreLayout(app: FrontendApplication): Promise<boolean> {
@@ -160,8 +163,8 @@ export class ShellLayoutRestorer extends TheiaShellLayoutRestorer {
                 constructionOptions: {
                   factoryId: EditorWidgetFactory.ID,
                   options: {
-                    uri,
                     kind: 'navigatable',
+                    uri,
                     counter: 0,
                   },
                 },

arduino-ide-extension/src/browser/theia/core/widget-manager.ts

@@ -0,0 +1,48 @@
+import type { MaybePromise } from '@theia/core';
+import type { Widget } from '@theia/core/lib/browser';
+import { WidgetManager as TheiaWidgetManager } from '@theia/core/lib/browser/widget-manager';
+import { injectable } from '@theia/core/shared/inversify';
+import deepEqual = require('deep-equal');
+
+@injectable()
+export class WidgetManager extends TheiaWidgetManager {
+  /**
+   * Customized to find any existing widget based on `options` deepEquals instead of string equals.
+   * See https://github.com/eclipse-theia/theia/issues/11309.
+   */
+  protected override doGetWidget<T extends Widget>(
+    key: string
+  ): MaybePromise<T> | undefined {
+    const pendingWidget = this.findExistingWidget<T>(key);
+    if (pendingWidget) {
+      return pendingWidget as MaybePromise<T>;
+    }
+    return undefined;
+  }
+
+  private findExistingWidget<T extends Widget>(
+    key: string
+  ): MaybePromise<T> | undefined {
+    const parsed = this.parseJson(key);
+    for (const [candidateKey, widget] of [
+      ...this.widgetPromises.entries(),
+      ...this.pendingWidgetPromises.entries(),
+    ]) {
+      const candidate = this.parseJson(candidateKey);
+      if (deepEqual(candidate, parsed)) {
+        return widget as MaybePromise<T>;
+      }
+    }
+    return undefined;
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  private parseJson(json: string): any {
+    try {
+      return JSON.parse(json);
+    } catch (err) {
+      console.log(`Failed to parse JSON: <${json}>.`, err);
+      throw err;
+    }
+  }
+}

arduino-ide-extension/src/browser/theia/editor/editor-contribution.ts

@@ -1,21 +1,13 @@
 import { injectable } from '@theia/core/shared/inversify';
-import { EditorPreviewContribution as TheiaEditorPreviewContribution } from '@theia/editor-preview/lib/browser/editor-preview-contribution';
 import { TextEditor } from '@theia/editor/lib/browser';
+import { EditorContribution as TheiaEditorContribution } from '@theia/editor/lib/browser/editor-contribution';
 
 @injectable()
-export class EditorPreviewContribution extends TheiaEditorPreviewContribution {
-  protected updateLanguageStatus(editor: TextEditor | undefined): void {}
-
-  // protected setCursorPositionStatus(editor: TextEditor | undefined): void {
-  //   if (!editor) {
-  //     this.statusBar.removeElement('editor-status-cursor-position');
-  //     return;
-  //   }
-  //   const { cursor } = editor;
-  //   this.statusBar.setElement('editor-status-cursor-position', {
-  //     text: `${cursor.line + 1}`,
-  //     alignment: StatusBarAlignment.LEFT,
-  //     priority: 100,
-  //   });
-  // }
+export class EditorContribution extends TheiaEditorContribution {
+  protected override updateLanguageStatus(
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars, unused-imports/no-unused-vars
+    editor: TextEditor | undefined
+  ): void {
+    // NOOP
+  }
 }