GitUI was close due to an unexpected panic

[RubberJones]

Description
If I use 'Blame' on my file, the application crashes. The file is in JSON format.

Reproduce
If I open the commit with the JSON file with the right arrow and then press 'Blame', the programme crashes with this message.

Output
PanicInfo { payload: Any { .. }, message: Some(index out of bounds: the len is 60 but the index is 60), location: Location { file: "src/popups/blame_file.rs", line: 622, col: 38 }, can_unwind: true, force_no_backtrace: false }
trace:
0: gitui::set_panic_handlers::{{closure}}
1: std::panicking::rust_panic_with_hook
2: std::panicking::begin_panic_handler::{{closure}}
3: std::sys_common::backtrace::__rust_end_short_backtrace
4: rust_begin_unwind
5: core::panicking::panic_fmt
6: core::panicking::panic_bounds_check
7: gitui::app::App::draw_popups
8: gitui::app::App::draw
9: gitui::run_app
10: gitui::main
11: std::sys_common::backtrace::__rust_begin_short_backtrace
12: main
13: __libc_start_call_main
14: __libc_start_main_impl
15: _start

Context

• OS: Fedora 39, 6.7.9-200.fc39.x86_64
• git version: 2.44.0
• Rust version: 1.76.0 (c84b36747 2024-01-18)

[extrawurst]

duplicate of #2130