Unresponsive UI when copying a line from a modified file

[matheusjunior]

Describe the bug
Copying a line using [y] makes the UI unresponsive. It takes a long time, roughly a minute or possibly more, on a reasonably sized repo for it to get responsive again.

To Reproduce

1. Download a reasonably sized repo, e.g., https://github.com/ava-labs/avalanchego
2. Make a minor change on any given file, e.g., add fadsfasd to README.md.
3. Save the modified file.
4. Open gitui on Status tab [1]
5. Navigate to modified file.
6. Copy any line in the highlighted hunk.

Expected behavior
UI does not get stuck when copying a single line.

Screenshots
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Context (please complete the following information):

• OS/Distro + Version: Ubuntu 20.04.6 LTS 5.15.0-69-generic
• GitUI Version 0.22.1
• Rust version: rustc 1.66.1 (90743e729 2023-01-10)

Additional context
Add any other context about the problem here.

[stale]

This issue has been automatically marked as stale because it has not had any activity half a year. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.