[Language server] Content of language server hover feature is duplicated

[SkorikSergey]

Description

Content of hover feature is duplicated after workspace restarting in next LS:

• PHP language server.
• Python language server
• Camel language server
• Yaml language server.
• Golang language server.

For PHP and Python language servers hover content is duplicated on the first start of workspace( PHP - #10065 and Python - #10063.).

Reproduction Steps

1. Start a workspace with enabled language server from list above.
2. Open a file and check that a LS initialized.
3. Check hover content.
4. Restart the workspace.
5. Check hover content again.

Addition information:

[tsmaeder]

In the constructor of org.eclipse.che.plugin.languageserver.ide.LanguageServerExtension, a listener is hooked up which calls defaultHoverProviderInitializer.initialize() on each workpace startup. That in turn registers our hover provider each time.

[ghost]

Labeled as P1 since it affects language support for all languages.

[slemeur]

This does impact Java and NodeJS too

[amisevsk]

C# as well. In the ps -ax output for the workspace I see

513 ?  S      0:00 /bin/sh /home/user/che/ls-csharp/launch.sh
514 ?  S      0:00 bash /home/user/che/ls-csharp/run -lsp
522 ?  Sl     0:10 /home/user/che/ls-csharp/bin/mono.linux-x86_64 /home/user/che/ls-csharp/omnisharp/OmniSharp.exe -lsp