分屏的关闭事件，相关样式调整

shuishen

2021-06-04 a239631f7bbd0c17037c31d3fcb04504ab317c51

1
.claro .dijitTitlePaneRtl .dijitClosed .dijitArrowNode,.claro .dijitFieldsetRtl .dijitFieldsetTitleClosed .dijitArrowNode {background-position: -7px 0;}