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Re:Kakoune – A Modal Text Editor by honkycat on Tuesday March 05, 2019 @03:59PM (#19314190)
I have been interested in Kakoune before, and I have never been able to nail this answer down:

Does Kakoune feature IDE-style omnicompletion? Like Elixir module name and function completion.

Re:Kakoune – A Modal Text Editor by andrewla on Tuesday March 05, 2019 @04:06PM (#19314244)
To some degree; your best bet is LSP integration but so far things have been a little flakier than I like because my environment is strange. But given the architecture of their extensibility model I'm extremely optimistic.
Re:Kakoune – A Modal Text Editor by sevensor on Tuesday March 05, 2019 @04:22PM (#19314377)
I believe kak supports LSP, although I haven't tried. By default, it offers you completions from all of your open buffers.