Looks like this property was introduced in D3669. I understand fixing the width of the modals, but I think we can let the height expand to fit the content?
It doesn't seem right to arbitrarily cap the possible height of a Modal at this level of abstraction? I understand there might be the need to cap it for specific Modals?
For example, here's the `ThreadSettingsModal` before and after this diff:
Before:
{F49119}
After (and before D3669):
{F49120}