Internal Out-Default doesn't work and messages to host are buffered?

[ryhayash]

Steps to reproduce

PowerShell console messages are not displayed with correct order. This issue happens with a lot of cmdlets but some cmdlets(ex get-process/get-service) work well. For example, run the following script. You can see the messages shown with wrong order. I know 'Out-Default' is called internally from most of get-xxx cmdlets but it looks like it does't work in some cases. I think console messages should be displayed sequentially with correct order because 'Out-Default' is called internally. But actual behavior is not(Out-Default is called but the message is buffered and not displayed). So please check if this is a bug or by design with host message buffering.

Write-Output "Before get-acl"
get-acl 
Write-Output "After get-acl"
Read-host "Enter something"

Expected behavior

The output messages are displayed in powershell console/ISE with the following order.

Before get-acl

    ディレクトリ: C:\WINDOWS

Path     Owner                       Access                                                                                                      
----     -----                       ------                                                                                                      
system32 NT SERVICE\TrustedInstaller CREATOR OWNER Allow  268435456...                                                                           

After get-acl
Enter something: 

Actual behavior

The powershell console/ISE shows the messages in wrong order like this. The output of get-acl is buffered and not displayed and message of Read-Host appears prior to output of get-acl.

Before get-acl

Enter something:   <---- Should be displayed after output of get-acl

    ディレクトリ: C:\WINDOWS

Path     Owner                       Access                                                                                                      
----     -----                       ------                                                                                                      
system32 NT SERVICE\TrustedInstaller CREATOR OWNER Allow  268435456...                                                                           
After get-acl

Environment data

PS C:\WINDOWS\system32> $PSVersionTable


Name                           Value                                                                                                             
----                           -----                                                                                                             
PSVersion                      5.1.14393.1532                                                                                                    
PSEdition                      Desktop                                                                                                           
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                                           
BuildVersion                   10.0.14393.1532                                                                                                   
CLRVersion                     4.0.30319.42000                                                                                                   
WSManStackVersion              3.0                                                                                                               
PSRemotingProtocolVersion      2.3                                                                                                               
SerializationVersion           1.1.0.1                                                                                                           

[mklement0]

Please see #4594.

[iSazonov]

Closed as dup #4594.