panicked at 'index out of bounds: the len is 0 but the index is 0', src/document.rs:385:21

[Jose Antonio Delgado Alfonso]

Describe the bug
Edit an empty buffer causes a panic.

To Reproduce
Steps to reproduce the behavior:

1. Execute ox with no parameters.
2. Press backspace key twice.
3. The application panics showing

thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', src/document.rs:385:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[1]    713693 abort (core dumped)  ox

Expected behavior
Control an empty buffer and do not panic.

Screenshots

Desktop (please complete the following information):

• OS: ArchLinux
• commit (fd24743)

[Luke]

duplicate