Hunk staging / unstaging / reset does not work for number of context lines != 3

[raphCode]

Describe the bug
In the options, the number of context lines must be set to exactly 3, otherwise hunk management does not work at all.
That is, staging / unstaging / resetting of whole hunks.

To Reproduce
Steps to reproduce the behavior:

1. Have multiple unstaged changes scattered across a file, e.g. in line 1 and line 10
2. Open gitui in the first Tab (Status)
3. Press O
4. Set the option Context lines to any other number than 3
5. Try to stage a single hunk by selecting it and pressing Enter (nothing happens)
6. Stage the whole file
7. Try to unstage a single hunk by selecting it and pressing Enter (error: hunk not found)
8. Unstage the whole file
9. Try to reset a hunk by selecting it and pressing Shift D (crash: hunk not found)

Expected behavior
Staging, unstaging and resetting works like with number of context lines = 3

Context (please complete the following information):

• OS: Arch
• GitUI Version 0.23.0

Related issues:

• Crash when resetting hunk of non standard size #1512
• Unable to stage a specific hunk on macOS Monterey #1561