Panic when creating too many splits

[Raspberry1111]

Summary

When creating splits with C-W + s or C-W + v, helix will panic if you create to many with an index out of bounds error.

Reproduction Steps

I tried this:

Make tons of horizontal and vertical splits
Ex: Spam C-W + s and C-W + v

I expected this to happen:

The windows to open or for helix to stop opening them and warn me that I created to many

Instead, this happened:

thread 'main' panicked at 'index out of bounds: the len is 10650 but the index is 10650', helix-tui/src/buffer.rs:458:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Helix log

No response

Platform

Linux

Terminal Emulator

kitty 0.19.3

Helix Version

helix 0.6.0 (838cfcc)

[archseer]

Duplicate of #1083