Menu customizer: Search results section is cut off

[helen]

Now that the search results section doesn't behave like the other item sections, it doesn't need to be a part of the section height calculation routine. For reference, this section height manipulation behavior is to avoid double scrollbars where possible on setups that persistently display them.

[valendesigns]

We need to double back on itemSectionHeight in 4.4. However, this will help to mitigate the truncated results in the meantime. It's not pretty, but it works.

+1

[westonruter]

33375.diff​ fixes the truncated search results for me when the dev tools are open.

+1

[markjaquith]

Would prefer a solution that was not specific to one thing, but this should do for 4.3.

[helen]

In 33618:

Menu customizer: Ensure the search results section is full height.

fixes #33375.