Control-l causes crash

[pavelbraginskiy]

Environment data

PS version: 6.1.0-preview.3
PSReadline version: 2.0.0-beta2
os: Linux ThinkPad 4.16.16-300.fc28.x86_64 #1 SMP Sun Jun 17 03:02:42 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
PS file version: 

Steps to reproduce or exception report

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Report on GitHub: https://github.com/lzybkr/PSReadLine/issues/new
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Last 1 Keys:
 Ctrl+l

Exception:
System.PlatformNotSupportedException: Operation is not supported on this platform.
   at System.ConsolePal.SetWindowPosition(Int32 left, Int32 top)
   at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(ConsoleKeyInfo key, Dictionary`2 dispatchTable, Boolean ignoreIfNoAction, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.InputLoop()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics)
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[lzybkr]

Closing as a duplicate of #654.