Set-PSReadlineOption -MaximumHistoryCount ignored in profile

[jdhitsolutions]

Steps to reproduce

Open a PowerShell console and run

Set-PSReadlineOption -MaximumHistoryCount 512

Get-PSReadlineOption confirms the change.

Expected behavior

We should be able to set the maximum history count with Set-PSReadlineOption in a profile script.

Actual behavior

But when you put the same command in a PowerShell profile script, the parameter is ignored. Although if you set something like -HistoryNoDuplicates or -HistorySearchCaseSensitive those settings will be configured through the profile script. Get-PSReadlineOption shows the default value for MaximumHistoryCount.

Environment data

Name                           Value                                                                                   
----                           -----                                                                                   
PSVersion                      5.1.16275.1000                                                                          
PSEdition                      Desktop                                                                                 
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                 
BuildVersion                   10.0.16275.1000                                                                         
CLRVersion                     4.0.30319.42000                                                                         
WSManStackVersion              3.0                                                                                     
PSRemotingProtocolVersion      2.3                                                                                     
SerializationVersion           1.1.0.1                                                                                 

I get similar results in beta-6 on Linux.

[jdhitsolutions]

After a quick exchange with @lzybkr it appears that the built-in PowerShell variable $MaximumHistoryCount over rides any setting you make with Set-PSReadLineOption. If I set $MaximumHistoryCount in my profile, that is the value that PSReadline uses. So I guess this isn't a bug. BUT since this feature is ignored, it should be deprecated or at least have the documentation updated.

[daxian-dbw]

This is actually a bug. Run Set-PSReadlineOption -MaximumHistoryCount from user's profile should work as rest of the settings.