Merge from vscode 1ec43773e37997841c5af42b33ddb180e9735bf2

src/vs/workbench/common/editor.ts

@@ -1302,6 +1302,7 @@ interface IEditorPartConfiguration {
 	highlightModifiedTabs?: boolean;
 	tabCloseButton?: 'left' | 'right' | 'off';
 	tabSizing?: 'fit' | 'shrink';
+	titleScrollbarSizing?: 'default' | 'large';
 	focusRecentEditorAfterClose?: boolean;
 	showIcons?: boolean;
 	enablePreview?: boolean;