Is your enhancement related to a problem? Please describe.

The documentation for importing the self signed cert [1] is somewhat unclear -- by default when I follow these instructions, the certificate that ends up exported is not an authority; to get the right one I n

Document the commands that clients should implement and their expected behaviour on https://github.com/eclipse/eclipse.jdt.ls/wiki/JDT-LS-Extensions

Consider the following:

void meth(Closure closure) {
  closure.|
}

When invoking content assist (Ctrl+Space) at |, the methods and properties of groovy.lang.Closure are very low in the list of proposals. This is due to very-well-known type adjustments made within org.codehaus.groovy.eclipse.codeassist.proposals.AbstractGroovyProposal.getRelevanceClass().

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