Intellisense/Tab-completion Intermittent Failures

[pcarnella]

System Details

• Operating system name and version: Windows 10 Pro
• VS Code version: 1.12.1
• PowerShell extension version: 1.0
• Output from $PSVersionTable:
  Name Value
  PSVersion 5.1.14393.693
  PSEdition Desktop
  PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
  BuildVersion 10.0.14393.693
  CLRVersion 4.0.30319.42000
  WSManStackVersion 3.0
  PSRemotingProtocolVersion 2.3
  SerializationVersion 1.1.0.1

Copy / paste the below commands into the PowerShell Integrated Terminal, and paste the output here

code -v
$pseditor.EditorServicesVersion

Major  Minor  Build  Revision
-----  -----  -----  --------
1      0      0      0
code --list-extensions --show-versions
code : The term 'code' is not recognized as the name of a cmdlet, function, script file, or
operable program. Check the spelling of the name, or if a path was included, verify that the
path is correct and try again.
At line:1 char:1
+ code --list-extensions --show-versions
+ ~~~~
    + CategoryInfo          : ObjectNotFound: (code:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
$PSVersionTable

Issue Description

Tab completion often fails for me. For example, typing "get-pro" or "get-serv" and hitting Tab does not complete the command as expected, it will just tab the cursor over. I works if I type slowly or wait a second. Very repeatable. I've had this problem on multiple versions, going back over a year. I tried completely re-installing VSCode/PowerShell extension and deleting code folder in user profile.

Attached Logs

I see this repeated in the log every time the issue happens:

5/10/2017 3:21:10 PM [ERROR] - Method "DispatchMessage" at line 301 of C:\projects\powershelleditorservices\src\PowerShellEditorServices.Protocol\MessageProtocol\MessageDispatcher.cs

Follow the instructions in the README
about capturing and sending logs.

[daviwil]

@pcarnella thanks for the report! That log statement doesn't give enough context, can you grab the lines that are indented below it too? That'd be helpful.

When this problem occurs, does the situation improve after running this command in the integrated console:

Remove-Module PackageManagement

[pcarnella]

Thanks for looking into it, some more info...

PackageManagement module not loaded:

Remove-Module : No modules were removed. Verify that the specification of modules to remove is correct and those modules exist in the runspace.
At line:1 char:1

• Remove-Module PackageManagement

5/10/2017 7:59:16 PM [ERROR] - Method "DispatchMessage" at line 301 of C:\projects\powershelleditorservices\src\PowerShellEditorServices.Protocol\MessageProtocol\MessageDispatcher.cs

MessageDispatcher: No handler registered for Event type '$/cancelRequest'

That's all there is in the log when the issue happens.

[daviwil]

Interesting that the editor is sending a cancellation request... I wonder what's going on there. Can you e-mail me the whole log file? daviwil at microsoft.com.

[rjmholt]

The $/cancelRequest message is something that VSCode sends when it wants the language server to move on. We mark not handling the cancellation message as an error but there's no semantic harm in ignoring it (see here). The log will mark this as a warning from the next release, rather than an error.

I think the problem above is a performance issue, which we're tracking in #1256. I'm going to close this as a duplicate (even though it came first) so we can consolidate information.