This PR adds selecting versions of the next/previous/up/down sexp commands. The selecting versions use the same keystrokes plus shift, similar to normal selecting with the arrow keys.
Additionally, I ended up fixing a few other issues while I was at it: fixing the selectors for the keybindings so that ctrl + up/down does the sexp navigation instead of switching lines; and improving the behavior of a few things when multiple cursors are present.
This PR adds selecting versions of the next/previous/up/down sexp commands. The selecting versions use the same keystrokes plus shift, similar to normal selecting with the arrow keys. Additionally, I ended up fixing a few other issues while I was at it: fixing the selectors for the keybindings so that ctrl + up/down does the sexp navigation instead of switching lines; and improving the behavior of a few things when multiple cursors are present.