Crashes when trying to show log in a git repo with chinese commit messages on Windows 10

[slaughtering]

Describe the bug
Crashes when trying to show log in a git repo with chinese commit messages on Windows 10

To Reproduce
Steps to reproduce the behavior:

1. Open cmd or pwsh and cd to a git repo with chinese commit log messages
2. Run gitui
3. Press 2 to show the log
4. See error:
   panic: PanicInfo { payload: Any, message: Some(byte index 118 is not a char boundary; it is inside '里' (bytes 117..120)
   C:\repos\someproject>中文提交信息(some chinese commit message)`), location: Location { file: "/rustc/c7087fe00d2ba919df1d813c040a5d47e43b0fe7\src\libcore\str\mod.rs", line: 1920, col: 47 } }
   trace:
   0: <unknown>
   1: <unknown>
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: <unknown>
   6: <unknown>
   7: <unknown>
   8: <unknown>
   9: <unknown>
   10: <unknown>
   11: <unknown>
   12: <unknown>
   13: <unknown>
   14: git_libgit2_version
   15: BaseThreadInitThunk
   16: RtlUserThreadStart

Context (please complete the following information):

• OS/Distro + Version: [Windows 10 1909]
• GitUI Version [0.8.1]
• Rust version: [N/A]

Additional context
The same problem in pwsh 7.0.2 and cmd.exe, gitui.exe binary from https://github.com/extrawurst/gitui/releases/tag/v0.8.1

[extrawurst]

@slaughtering Thanks for reporting this, to be able to reproduce this it would be super helpful to have the causing commit message, are you able to share that one?

[slaughtering]

@slaughtering Thanks for reporting this, to be able to reproduce this it would be super helpful to have the causing commit message, are you able to share that one?

Yep, and here is one :
panic: PanicInfo { payload: Any, message: Some(byte index 118 is not a char boundary; it is inside '里' (bytes 117..120) of 1. 导入按钮由选文件改为选目录，因为整个过程中要用到多个mdb文件，这些文件是在程序里写死的，暂且这么来做，有时间了后 再做调整), location: Location { file: "/rustc/c7087fe00d2ba919df1d813c040a5d47e43b0fe7\src\libcore\str\mod.rs", line: 1920, col: 47 } }

The commit message :

1. 导入按钮由选文件改为选目录，因为整个过程中要用到多个mdb文件，这些文件是在程序里写死的，暂且这么来做，有时间了后再做调整 2. cboxLine增加indexHasChanged事件 3. 到目前为止基本上实现了：点击线路弹出设置对话框的功能