[native filter][cascading] when selecting value for child filter, the dropdown list become full of the popover window

[jinghua-qa]

when selecting a value for child filter, the dropdown list become full of the popover window, can not see the parent filter and child filter, only child filter options in the popover window. Then user need to click on the blank edge of the popover window to see parent filter again.

Expected results

parent filter and child filter field exist in popover window, and child filter options are listed under the child filter field

Actual results

when selecting options only the

child filter option is in the popover window

Screenshots

cascade.filter.mov

How to reproduce the bug

1. create a cascade filter group
2. go to the child filter and select value for that
3. observe the popover window
4. See error

Environment

(please complete the following information):

• superset version: master
• python version: python --version
• node.js version: node -v
• any feature flags active:

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.

Additional context

Add any other context about the problem here.