Comment by kjksf

Don't worry about being nice, 15 years doing open source develops a thick skin.

But you didn't respond: which language should I use?

Go didn't exist when I started SumatraPDF.

And while I write pretty much everything else in Go and love the productivity, it wouldn't be a good fit.

A big reason people like Sumatra is that it's fast and small. 10 MB (of which majority are fonts embedded in the binary) and not 100MB+ of other apps.

Go's "hello world" is 10 MB.

Plus abysmal (on Windows) interop with C / C++ code.

And the reason SumatraPDF is unportable to mac / linux is not the language but the fact that I use all the Windows API I can for the UI.

Any cross-platform UI solution pretty much require using tens of megabytes of someone else's reimplementation of all the UI widgets (Qt, GTK, Flutter) or re-implementing a smaller subset of UI using less code.