Write-Progress incorrectly shows 100% until 1% of the task is completed

[wi-fr]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

for ($i = 0; $i -le 2; $i += 0.1) { 
  Write-Progress -Activity 'DEMO' -Status $i -PercentComplete ([int]$i)
  Start-Sleep 1
}


### Expected behavior

```console
The progress bar shows 0% before 1% of the task is completed.

Actual behavior

The progress bar shows 100% before 1% of the task is completed.

In Windows PowerShell 5.1 the code snippet works as expected.

Error details

No error

Environment data

$PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.3.1
PSEdition                      Core
GitCommitId                    7.3.1
OS                             Microsoft Windows 10.0.19045
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}       
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

No response

[mklement0]

Good find; let me boil it down to the core problem:

• -Percent 0 is incorrectly treated like -Percent 100, i.e. the whole progress bar is unexpectedly filled in; with $PSStyle.Progress.View = 'Classic', nothing is shown.

# !! Shows the whole bar filled in, as if -PercentComplete 100 had been passed.
# !! If $PSStyle.Progress.View = 'Classic', nothing shows at all.
Write-Progress -Activity Test -Status '0% complete' -PercentComplete 0; Start-Sleep 3

# OK: any value greater than 0 (1 - 100) - only the proportion reflecting the percentage is filled in.
Write-Progress -Activity Test -Status '1% complete' -PercentComplete 1; Start-Sleep 3

[SteveL-MSFT]

I found and fixed this as part of this PR: https://github.com/PowerShell/PowerShell/pull/18735/files#diff-cbda13b2a2d772c7dc93249087ce0e6b94bfdc7d022ab9eea9a752610674ab71R427

GitHub

Add progress to `Copy-Item` by SteveL-MSFT · Pull Request #18735 · PowerShell/PowerShell

PR Summary To show useful progress, this change requires collecting total files/bytes information first. The initial collection of total files and bytes is on a separate thread so no impact to sta...

🎉This issue was addressed in #18735, which has now been successfully released as v7.4.0-preview.2.:tada:

Handy links:

• Release Notes