Line chart keeps expanding animation when updating before init animation is finished

### What problem does this feature solve?
Currently line chart will stop expanding animation and remove clip-path if it is updated again. It is not visual friendly if we do `resize` after first-time `setOption` because animation will be suddenly stopped. I think it's possible to keep the clip-path animation even if the chart is updated immediately after first-time `setOption`

### What does the proposed API look like?
No new API needed