Right-click earlier text in console readout, then hit `escape` causes exception

Environment

Attribute	Value
PS version	7.1.0-preview.3
PSReadline version	2.1.0-beta1
os	10.0.19640.1 (WinBuild.160101.0800)
PS file version	7.1.0.0
HostName	ConsoleHost
BufferWidth:	104
BufferHeight	1000

 e n v : P R O Tab Tab Tab Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace g Tab Tab Tab \ Delete Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow Enter
 g e t - p r o Tab Spacebar - Tab Tab 2 3 2 2 0 LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow Spacebar Enter
 UpArrow Ctrl+Backspace 2 0 5 4 8 Enter
 UpArrow UpArrow UpArrow Ctrl+a Ctrl+x UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow Enter
 UpArrow Home Ctrl+RightArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow DownArrow DownArrow Enter
 UpArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow LeftArrow LeftArrow Ctrl+Delete Ctrl+RightArrow LeftArrow LeftArrow Ctrl+Delete Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+z Ctrl+z Ctrl+LeftArrow Ctrl+LeftArrow LeftArrow LeftArrow LeftArrow RightArrow Shift+Ctrl+RightArrow Shift+Ctrl+RightArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+RightArrow Ctrl+x Ctrl+RightArrow LeftArrow LeftArrow Shift+Ctrl+RightArrow Shift+Ctrl+RightArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow - - h e l p Ctrl+RightArrow LeftArrow LeftArrow LeftArrow LeftArrow Ctrl+Delete Delete Ctrl+LeftArrow Ctrl+LeftArrow RightArrow RightArrow RightArrow u p d a t e Enter
 UpArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow RightArrow RightArrow RightArrow RightArrow RightArrow Delete Enter
 UpArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow Ctrl+LeftArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Delete - - p r e v i e w U p d a t e Escape

Exception

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'length')
   at System.Text.StringBuilder.Remove(Int32 startIndex, Int32 length)
   at Microsoft.PowerShell.PSConsoleReadLine.EditItemInsertChar.Undo()
   at Microsoft.PowerShell.PSConsoleReadLine.RevertLine(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)

Steps to reproduce

Prepare the scene by recalling an earlier command at the prompt using the up-arrow. Press back-arrow to move cursor into the spot at which you want to inject text from earlier in the console readout. Scroll up, highlight text in the console readout. Right-click the console to reproduce the text at the current cursor location. Hit escape to clear the command at the prompt. Sit back and enjoy the exception.

Expected behavior

Escape should not raise an exception after right click injecting text from the console readout.

Actual behavior

- System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'length')

[daxian-dbw]

Be noted that the predictive suggestion feature is disabled by default in 2.1.0-beta2, you can turn it on by Set-PSReadLineOption -PredictionSource History

[mavaddat]

Be noted that the predictive suggestion feature is disabled by default in 2.1.0-beta2, you can turn it on by Set-PSReadLineOption -PredictionSource History

You read my mind! I was literally just trying to figure out how to modulate this feature (turn it back on), reading this pull request thread about it and this sample profile.ps1 to achieve certain features.