As mentioned in #862, Intellij as great postfix support.. I'd love to see similar support in jdt.ls.

There's an existing 3rd party Eclipse plugin for that: Eclipse-Postfix-Code-Completion, which was supposed to be contributed to JDT. Currently the ticket is still open. We should try and help complete the current patch so it gets integrated upstream.

@snjeza @rgrunber @yaohaizh who's in?