Fixes #26313: Do not assume ownership of passed in options object

src/vs/editor/common/config/commonEditorConfig.ts

@@ -74,7 +74,7 @@ export abstract class CommonEditorConfiguration extends Disposable implements ed
 	constructor(options: editorOptions.IEditorOptions) {
 		super();
 
-		this._rawOptions = options || {};
+		this._rawOptions = objects.mixin({}, options || {});
 		this._validatedOptions = editorOptions.EditorOptionsValidator.validate(this._rawOptions, EDITOR_DEFAULTS);
 		this.editor = null;
 		this._isDominatedByLongLines = false;