This is a vis issue related to almende/vis#4030. When the data of timeline is
too much, it might not able to complete draw it before check and show it.
So force call redraw when got second changed event from outside to
show the timeline.
There are two changed event when page load.
I think the first one is when the container mounted in to the DOM.
And the second is when the timeline rendered.
This is a vis issue related to almende/vis#4030. When the data of timeline is too much, it might not able to complete draw it before check and show it. So force call
redrawwhen got secondchangedevent from outside to show the timeline.There are two
changedevent when page load. I think the first one is when the container mounted in to the DOM. And the second is when the timeline rendered.