Filtered search scroll should not stretch the box
In gitlab!54574 (merged) I set a fixed height on the current gitab filtered search so when the scrollbar was visible it didn't push down content, or cause unsightly button stretching.
Unfortunately the gl-ui one suffers this same malady, as shown in the following presentation:
Screen_Recording_2021-02-24_at_8.31.26_am
Note the stretching of the 'Search' button, then jumping down of the 'Props' heading. This should ideally be prevented, and the scrollbar instead take up the space provided by its bottom margin.