Proposal: Add “top-crop” vertical overflow modes to Live

[tnadav]

Hi everyone,

While using Live, I noticed that the current vertical_overflow modes ("crop", "ellipsis", "visible") always truncate lines from the bottom when the renderable exceeds the terminal height.

In some scenarios it would be more useful to show the most recent lines and crop from the top instead.

I’d like to propose adding two additional modes to complement the existing ones:

• "crop_top" – show only the last N lines that fit within the terminal height.
• "ellipsis_top" – same as above, but replace the first visible line with an ellipsis (…).

I’d be happy to contribute this feature and open a PR if the idea sounds reasonable.

Thanks for the great work on Rich — it’s been an invaluable tool for building polished terminal UIs.

Nadav