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  1. PO
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    <p>I verified this bug on my own machine. As soon as you start wrapping the buffer, -nonewline fails to live up to its task.</p> <p>You can do a few things as a workaround:</p> <p>1) Programmatically increase the BufferSize to a fixed size</p> <pre><code>$Host.UI.RawUI.BufferSize = New-Object System.Management.Automation.Host.Size(120, 5000) </code></pre> <p>2) Clear the screen every so often, perhaps every 100 nodes or after each node if you don't need to follow the output</p> <p>3) Clear the screen only when you've nearly reached the buffer limit</p> <pre><code>if($Host.UI.RawUI.CursorPosition.Y -gt ($Host.UI.RawUI.BufferSize.Height - 5)) {cls} </code></pre> <p>4) Clear only old parts of the screen buffer by temporarily reducing the size of the buffer. I used your function, untouched (except renaming to remove the second "-"). With the screen buffer at 100, the odd behavior would start at number 50 (2 output lines per loop)</p> <pre><code>49 / 2000 [####################] 100% | FINAL 50 / 2000 [#### ] 20% | First [######## ] 40% | Second [############ ] 60% | Third [################ ] 80% | Fourth [####################] 100% | FINAL 51 / 2000 [#### ] 20% | First [######## ] 40% | Second [############ ] 60% | Third [################ ] 80% | Fourth [####################] 100% | FINAL </code></pre> <p>But with the BufferSize switching, I made it all the way to 2000/2000 without a hitch </p> <pre><code>1998 / 2000 [####################] 100% | FINAL 1999 / 2000 [####################] 100% | FINAL 2000 / 2000 [####################] 100% | FINAL $range = 1..2000 </code></pre> <p>Test code below:</p> <pre><code>foreach($i in $range) { $Host.UI.RawUI.BufferSize = New-Object System.Management.Automation.Host.Size(120, 3000) Write-Host Write-Host $i "/ 2000" Update-ProgressBar "20" "First" Update-ProgressBar "40" "Second" Update-ProgressBar "60" "Third" Update-ProgressBar "80" "Fourth" Update-ProgressBar "100" "FINAL" $Host.UI.RawUI.BufferSize = New-Object System.Management.Automation.Host.Size(120, 2990) } </code></pre> <p>Realistically, you could combine 3 and 4 so that you only clear the old parts of the buffer when it is nearly full.</p>
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    1. VO
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    1. COThanks for confirming the bug and finding a solution. I was able to combine steps 3 and 4 successfully-- so I've marked this answer as correct.
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      1. UStuckerism
 

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