[Sqllab] results table overlap buttons, horizontal scroll doesn't work when column is 50+

[michellethomas]

If you run a query in sqllab that returns a large number of columns, the results header shows up on top of the "explore" and "csv" buttons making them not clickable.

Screenshots

How to reproduce the bug

1. Run a select * statement on a table with 70+ columns
2. Results header will show up on top of the action buttons and you cannot click on the buttons

Environment

• superset version: master

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

[junlincc]

[betodealmeida]

Let me take a look, I worked on the height of the results recently and might've broken this.

[betodealmeida]

Looks like it happen when have more than MAX_COLUMNS_FOR_TABLE columns (which defaults to 50), and we invoke renderGrid in FilterableTable.tsx.