Multi select in data editor doesn't support scrolling

[deepakpathania-zz]

In the environment modal, if we try to do multi-select by dragging for a lot of values, then the selector doesn't support scrolling for selecting and scrolling simultaneously.

Steps to reproduce the behavior:

1. Go to Manage Environments.
2. Create an environment with multiple values (to enable scroll)
3. Try to select multiple values (beneath the current view)
4. The selector box would not follow scrolling properly.

Expected behavior The multi-select should support selecting values with scrolling.