Remove dupe context key service registration in cell

Fix #111280

Author: roblourens

src/vs/platform/contextkey/browser/contextKeyService.ts

@@ -417,7 +417,12 @@ class ScopedContextKeyService extends AbstractContextKeyService {
 		if (domNode) {
 			this._domNode = domNode;
 			if (this._domNode.hasAttribute(KEYBINDING_CONTEXT_ATTR)) {
-				console.error('Element already has context attribute');
+				let extraInfo = '';
+				if ((this._domNode as HTMLElement).classList) {
+					extraInfo = Array.from((this._domNode as HTMLElement).classList.values()).join(', ');
+				}
+
+				console.error(`Element already has context attribute${extraInfo ? ': ' + extraInfo : ''}`);
 			}
 			this._domNode.setAttribute(KEYBINDING_CONTEXT_ATTR, String(this._myContextId));
 		}

src/vs/workbench/contrib/notebook/browser/view/renderers/cellRenderer.ts

@@ -712,13 +712,14 @@ export class CodeCellRenderer extends AbstractCellRenderer implements IListRende
 
 		const executionOrderLabel = DOM.append(cellContainer, $('div.execution-count-label'));
 
+		const editorPart = DOM.append(cellContainer, $('.cell-editor-part'));
+		const editorContainer = DOM.append(editorPart, $('.cell-editor-container'));
+
 		// create a special context key service that set the inCompositeEditor-contextkey
-		const editorContextKeyService = disposables.add(this.contextKeyServiceProvider(container));
+		const editorContextKeyService = disposables.add(this.contextKeyServiceProvider(editorPart));
 		const editorInstaService = this.instantiationService.createChild(new ServiceCollection([IContextKeyService, editorContextKeyService]));
 		EditorContextKeys.inCompositeEditor.bindTo(editorContextKeyService).set(true);
 
-		const editorPart = DOM.append(cellContainer, $('.cell-editor-part'));
-		const editorContainer = DOM.append(editorPart, $('.cell-editor-container'));
 		const editor = editorInstaService.createInstance(CodeEditorWidget, editorContainer, {
 			...this.editorOptions.value,
 			dimension: {