src/vs/workbench/browser/parts/editor/editorStatus.ts/EditorStatus/onIndentationChange
class EditorStatus:	private onIndentationChange(editorWidget: ICodeEditor | undefined): void {
		const update: StateDelta = { type: 'indentation', indentation: undefined };

		if (editorWidget) {
			const model = editorWidget.getModel();
			if (model) {
				const modelOpts = model.getOptions();
				update.indentation = (
					modelOpts.insertSpaces
						? localize('spacesSize', "Spaces: {0}", modelOpts.indentSize)
						: localize({ key: 'tabSize', comment: ['Tab corresponds to the tab key'] }, "Tab Size: {0}", modelOpts.tabSize)
				);
			}
		}

		this.updateState(update);
	}