The bug when change to vim normal mode

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
csharp, powershell
Domain
cli

Research direction

Start by reproducing the reported key sequence in PSReadLine 2.4.5 on PowerShell 7.6.2, then trace the ViIndicateCommandMode and ViCommandMode entries shown in the exception stack. Done means pressing Escape to enter Vim normal mode no longer displays a null-valued-expression error.

Written by the indexing model from the issue text.

Description

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: 7.6.2
OS: Microsoft Windows 10.0.26200
BufferWidth: 145
BufferHeight: 35

Last 11 Keys:

 l s Backspace Backspace Escape i c l s Enter Escape

### Exception

System.Management.Automation.RuntimeException: You cannot call a method on a null-valued expression.
   at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
   at System.Management.Automation.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.ScriptBlock.InvokeWithPipeImpl(ScriptBlockClauseToInvoke clauseToInvoke, Boolean createLocalScope, Dictionary`2 functionsToDefine, List`1 variablesToDefine, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Pipe outputPipe, InvocationInfo invocationInfo, Object[] args)
   at System.Management.Automation.ScriptBlock.InvokeWithPipe(Boolean useLocalScope, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Pipe outputPipe, InvocationInfo invocationInfo, Boolean propagateAllExceptionsToTop, List`1 variablesToDefine, Dictionary`2 functionsToDefine, Object[] args)
   at System.Management.Automation.ScriptBlock.DoInvokeReturnAsIs(Boolean useLocalScope, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Object[] args)
   at System.Management.Automation.ScriptBlock.InvokeReturnAsIs(Object[] args)
   at Microsoft.PowerShell.PSConsoleReadLine.ViIndicateCommandMode()
   at Microsoft.PowerShell.PSConsoleReadLine.ViCommandMode(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

when press escape to change to vim normal model, show the bug information above.

Environment data
### Environment
PSReadLine: 2.4.5
PowerShell: 7.6.2
OS: Microsoft Windows 10.0.26200
BufferWidth: 145
BufferHeight: 35

Last 11 Keys:

 l s Backspace Backspace Escape i c l s Enter Escape
Steps to reproduce

press escape to change to vim normal model, it and enter into normal model , but show the bug information everytime

Expected behavior

don't show the bug information

Actual behavior

show bug information

Dominant language
C#
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