src/vs/workbench/api/common/extHostDocumentsAndEditors.ts/ExtHostDocumentsAndEditors/activeEditor
class ExtHostDocumentsAndEditors:	activeEditor(internal?: true): vscode.TextEditor | ExtHostTextEditor | undefined {
		if (!this._activeEditorId) {
			return undefined;
		}
		const editor = this._editors.get(this._activeEditorId);
		if (internal) {
			return editor;
		} else {
			return editor?.value;
		}
	}