Redesign: Expanding MELS leaves a gap at the bottom

[turt2live]

https://matrix.to/#/!XIydWLOEJvcDBKwWKE:matrix.org/$154870374840571lanqS:maunium.net?via=matrix.org&via=disroot.org&via=matrixim.cc

[bwindels]

should only happen if you expand while somebody is typing.
to fix it we'd have to clear the min-height when you click collapse again...

[turt2live]

Presuming fixed (I can't easily reproduce)