Well I tried to understand how NECompletion works , after a month of reading and rereading code still could not figure out how it works. I understood the basics, but the details were so difficult to really track down. Its very spagetified, a usual pharo issue, and of course undocumented. I decided to move to things that I could be more productive with. This is an area that requires the touch of a Pharo expert.��
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(did you know, that there is a��shortcut��to jump from one message send argument to another (not related to completion, but very helpful). Sadly this is gone or I couldn't find��it in rubrics��shortcut��handling).
maybe this is related to Settings > Code Browsing > AST navigation? (I've never actually tried to use this.)