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`KillRegion` function raises an unhandled exception on empty region

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还没有人认领这个 Issue。

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难度
2/5
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1-3 小时
新手友好度
64/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
停滞
技术栈
csharp
领域
cli

调研方向

首先使用文档中记录的 KillRegion 和 SetMark 绑定重现该问题，然后沿着从 KillRegion 到 Kill 的堆栈跟踪进行排查。确认空区域的情况当前会引发异常。完成的标准是：在空区域上重复执行 KillRegion 时返回一个 ding，且不会出现未处理的异常。

由索引模型根据 Issue 内容生成。

描述

Needs-Triage :mag:
Prerequisites
  • Write a descriptive title.
  • Make sure you are able to repro it on the latest released version
  • Search the existing issues, especially the pinned issues.
Exception report
### Environment
PSReadLine: 2.4.5
PowerShell: 7.6.0-preview.5
OS: Microsoft Windows 10.0.26100
BufferWidth: 120
BufferHeight: 9001

Last 200 Keys:

 d l i n e o p Tab Tab Spacebar Spacebar Backspace - Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Shift+Tab Spacebar Tab Tab Tab Enter
 d f d f Backspace Backspace Backspace Backspace s e t - p s r e a d l i n e k e y h a n d l e r Spacebar c Backspace - c h o r t Tab Backspace d Tab Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace n o t e p a d Spacebar . \ p r o f i l e . p s q Backspace 1 Enter
 . Spacebar p r o Tab Enter
 t h i s Spacebar i d Spacebar a Spacebar d Backspace Backspace Backspace Backspace Backspace s Spacebar a Spacebar d e b a Backspace u g Spacebar t e s t LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow Ctrl+a LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow Ctrl+b Ctrl+b

### Exception

System.ArgumentOutOfRangeException: Index and length must refer to a location within the string. (Parameter 'length')
   at System.Text.StringBuilder.ToString(Int32 startIndex, Int32 length)
   at Microsoft.PowerShell.PSConsoleReadLine.Kill(Int32 start, Int32 length, Boolean prepend)
   at Microsoft.PowerShell.PSConsoleReadLine.KillRegion(Nullable`1 key, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(PSKeyInfo key, Dictionary`2 dispatchTable, Boolean ignoreIfNoAction, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.InputLoop()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics, CancellationToken cancellationToken, Nullable`1 lastRunStatus)
Screenshot
Image
Environment data
PS Version: 7.6.0-preview.5
PS HostName: ConsoleHost (Windows Terminal)
PSReadLine Version: 2.4.5
PSReadLine EditMode: Windows
OS: 10.0.26100.1 (WinBuild.160101.0800)
BufferWidth: 120
BufferHeight: 9001
Steps to reproduce
  1. Bind both the KillRegion and SetMark functions to a chord each (this is what profile.ps1 does in the example above)
  2. Set a mark with `SetMark anywhere on the line, except on the first column
  3. Move the cursor before the mark
  4. Kill the region of text between the cursor and the mark with KillRegion
  5. Try to kill the region again
Expected behavior

Since the region is empty and thus cannot be killed, the function should return a ding.

Actual behavior

An unhandled exception is raised.

主要语言
C#
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环境准备

从这里开始

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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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