SignatureHelp activeSignature/activeParameter not set for DOM nodes with

[mickaelistria]

With javac parser/resolver, the DOM is often more complete and fault-tolerant. This leads to some cases where SignatureHelpHandler gets into SignatureHelpUtils.getSignatureHelpFromASTNode successfully while ECJ doesn't. That is fine per se.
However, the SignatureHelp activeSignature/activeParameter are not set for this case. An example a piece of code like foo("", ); (with a missing arg) could lead to unset activeSignature/activeParameter with Javac (and maybe even with ECJ too).
This is perceived as an issue for the SignatureHelpHandlerTests.

If we want success with Javac for those tests, then either we need the tests to be changed, or -probably better-, we need SignatureHelpUtils.getSignatureHelpFromASTNode to set activeSignature/activeParameter for this case.

[mickaelistria]

No issue with JDT-LS, this was caused by the recovered node for missing parameters not properly setting source ranges in JavacConverter.