cal_heatmap hover window blocked by the title of slice in a dashboard

[izzyleung]

Example:

The cal_heatmap visualization does not have this problem in the home page of caravel, because it can overlay the hover window on the outside content.

Maybe we can move the cal_heatmap in the middle or enable content overlay.

[georgeke]

Took a quick look at this, I'm leaning towards the centering since the issue right now is that there is overflow: auto on the container which we need but contradicts the overflow: visible the tooltip (child) needs.

[poppop0911]

Version 0.15.1 still have this problem,
whether can through lift height of container,
place the heatmap below the container to solve this problem?

[abotero]

Fixed in #4268