Open Radar

 
Summary:

When backspacing over a pair of delimiters (such as (), {}, []), a single backspace is deleting _both_ of them. 

I usually expect when there's not a selection involved that a single backspace will remove a single character.  This is pretty hard-wired into my muscle memory.So when I want to do this scenario:

(cursor is at the | )

func stuff()| {

}

I want to add a parameter to the function, so I backspace once, type my parameter stuff, and then a close paren.  I have a deep typing pipeline (100wpm ftw), so my hands have already been told "_backspace_ blah thing: String) -> Bool", but because Xcode deleted the open paren, I now have gibberish:

func stuffblah thing: String) -> Bool {

}

So now I have to carefully acquire that place in the middle of `stuffblah` with the mouse or keyboard and fix it. By this time the automatic issues thing has plastered error messages everywhere, which courtesy of rdar://32718717 I can't hide, I get a headache due to chromatic aberration in my eyewear sending all the colors to random places along the Z-axis, dogs and cats living together, which makes me cranky and then I file radars :-)

Attached is a gif showing the problem. In each case, just a single backspace happens.

Steps to Reproduce:


Expected Results:


Actual Results:


Version/Build:


Configuration:
Version 9.0 (9A235)
10.12.6 (16G29)