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Re:Show HN: Sublime Merge – A Git client from the makers of ... by rdco on Friday September 21, 2018 @09:40AM (#18039592)
For your third point, maybe try out Kaleidoscope (macOS/iOS only):

https://www.kaleidoscopeapp.com/

You can map git difftool to it to launch it from the command line.

Re:Show HN: Sublime Merge – A Git client from the makers of ... by robin_reala on Sunday September 23, 2018 @02:39PM (#18052466)
Hey thanks, that actually looks really good! Will try it now.