What are the Cool Kids running with the demise of Atom?

Used to *love* Atom as a cross-platform GUI text editor - multiple language syntax highlighting, MD support, source control integration ...

But GitHub EoL'd it a couple years ago :\

What are folks running instead now?

(And as much as I love emacs (and can survive vi(m)) ... please do not suggest either of those - they're wonderful for what they are, but *neither* are what I'm asking about here )

Requirements:

- cross-platform (all three - Linux, macOS, Windows)

- multi-language syntax highlighting

- source-control integration

Nice-to-haves:

- extensible

- markdown support (with rendering for the final product)

- themable