manage breakpoints: expand list if dialog gets resized

Change-Id: I818a19a0a95991c97be539761d1f75e247880256
fdo#77886: add language: expand list if dialog gets resized

Yes, I actually figured out how to do that ;)

Change-Id: I9c62f57bbd07f44c9bf94a308a49df8c82eb2097