Find window: once grown it won't shrink back

[humdinger]

This is hrev54185.

When you query by attribute, add a few more criteria by clicking the "Add" button. The window will grow vertically. When you now reduce the criteria with the "Remove" button, the window stays tall, just showing an empty grey area where the widgets were removed.

It would be nicer to shrink the window height accordingly. BTW, any chance to make the window horizontally resizable?

[vidrep]

The download window has the same issue. https://dev.haiku-os.org/ticket/14252