Emacs 25 will make describe-key even smarter! You will be able to find out which keymap your keybinding was found in.
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Inspired the helpful Using Emacs series: https://cestlaz.github.io/posts/using-emacs-6-swiper/ I've been experimenting with C-s bound to swiper rather than isearch.
I'm a big fan of Anzu: https://github.com/syohex/emacs-anzu for enhancing isearch, but I'm finding that I use swiper more with this new keybinding.
Turns out that Emacs docstrings have an elaborate escaping mechanism. \[foo] shows the keybinding for foo, but \=\[foo] shows \[foo] literally.
If you're a Helpful user, we now handle this correctly, *and* show handy buttons!
Emacs keybinding of the day: C-x C-x, bound to exchange-point-and-mark. Moves point to the other end of selection ('region' in Emacs terms).