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Windows: $host.UI.RawUI.KeyAvailable has false positives. #959

mklement0 opened this issue Jul 6, 2019 · 1 comment


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commented Jul 6, 2019

Environment data

PS version: 7.0.0-preview.1
PSReadline version: 2.0.0-beta4
os: 10.0.18362.1 (WinBuild.160101.0800)
PS file version:
BufferWidth: 180
BufferHeight: 9999

Steps to reproduce or exception report

Note: The problem surfaces on Windows only.

Run the following code with and without PSReadLine imported:

# Show a spinner until the user presses a key.
$i=0; while (-not $host.UI.RawUI.KeyAvailable) { Write-Host -NoNewline ("`r{0}" -f '/―\|'[($i++ % 4)]); start-sleep -ms 200 }

Expected: A spinner should appear and keep spinning until the user presses a key.

Actual, with PSReadLine imported: The while loop is either never entered (1st invocation immediately after start of the PS session) or stops after one iteration even if no key is pressed (subsequent invocations).

Once you run Remove-Module PSReadLine, the behavior is as expected

@lzybkr lzybkr added the duplicate label Jul 6, 2019


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commented Jul 6, 2019

Duplicate of #901 and #291.

@daxian-dbw daxian-dbw added this to the 2.0.0-Consider milestone Jul 16, 2019

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