fix: IllegalStateException: Synchronizer should apply to only a single document, which is the one it was instantiated for

[angelozerr]

fix: IllegalStateException: Synchronizer should apply to only a single document, which is the one it was instantiated for

Fixes #752

I spend so many times to reproduce the problem without success (I have tried to change git branch to reload the document, I have tried to change encoding to try to change the document instance, etc, I cannot reproduce the problem)

I created a PR where:

• I removed the check of teh document instance
• I get the document from the virtual file when I need to add a document listener (when the language server must be restarted with already opened files) and when I remove the listener from the document to be sure that we work with the document from virtual file and not with a document which could be unused (which usecases does that?)

[fbricon]

is the field still necessary now?

[angelozerr]

I know it is not an elegant code,but commons use of document listener (add/remove) is to do it for the same document instance. I use this document instance to remove the listener (even if it could be used).

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[fbricon]

thanks @angelozerr!