_editGroupStart is not properly set when go back to history

[isti115]

I am so used to moving word by word in PowerShell under windows, that I keep pressing Ctrl+Left and Ctrl+Right under linux as well, which at some point resulted in the following message asking me to report this here:

Environment

PSReadLine: 2.0.0
PowerShell: 7.0.0
OS: Linux 5.6.8-arch1-1 #1 SMP PREEMPT Wed, 29 Apr 2020 16:22:56 +0000
Last 200 Keys

 Enter
 v i m Spacebar Backspace Backspace Backspace Backspace Backspace v i m Spacebar . Backspace Backspace Backspace Backspace Backspace Backspace v i m Spacebar Backspace Backspace Backspace Backspace c p Spacebar c o Tab B Tab Spacebar c o Tab B Tab Backspace Backspace Backspace Backspace l a g d a Enter
 v i m Spacebar c o Tab B Tab Backspace Backspace Backspace Backspace l Tab Enter
 v i m Spacebar - s Spacebar t e x t Backspace Backspace s t . v i m Spacebar - c Spacebar " " LeftArrow w g Backspace q RightArrow LeftArrow LeftArrow LeftArrow : RightArrow End Spacebar c o Tab B Tab Backspace Backspace Backspace Backspace l a g d a Enter
 v i m UpArrow UpArrow Enter
 UpArrow LeftArrow UpArrow UpArrow UpArrow UpArrow DownArrow DownArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow RightArrow Backspace Enter
 UpArrow UpArrow Enter
 UpArrow Enter
 UpArrow UpArrow Home RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow Backspace Backspace Backspace Delete Spacebar _ Backspace " Escape 1 ; 5 C UpArrow UpArrow DownArrow UpArrow Home RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow Escape

Exception

System.ArgumentOutOfRangeException: Non-negative number required. (Parameter 'count')
   at System.Collections.Generic.List`1.GetRange(Int32 index, Int32 count)
   at Microsoft.PowerShell.PSConsoleReadLine.EndEditGroup(Action`2 instigator, Object instigatorArg)
   at Microsoft.PowerShell.PSConsoleReadLine.GroupUndoHelper.EndGroup()
   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)

[daxian-dbw]

Here is the repro:

1. Make sure you are in VI edit mode.
2. Type cls and then press Enter
3. Type ok and then press Enter
4. Type abcdef and then press Escape to switch to Command mode
5. Press Shift+c which will delete the character f
6. Press UpArrow to get to the history entry ok
7. Press Escape to switch to Command mode.

the root cause is _editGroupStart is not reset when switching to a history item.