Open Radar

 
Summary:
The Xcode 9 release notes say:
> When text is selected, typing a opening delimiter adds a matching closing delimiter at the end of the selection. Auto-matched delimiters include " ", ( ), [ ], { }. (29164633)

That's a nice feature.  But, it also happens when pasting one of those opening delimiters, which I don't expect nor want.  Pasting should be literal, and always replace the selected text, no matter what the pasted content is.

Steps to Reproduce:
I often do editing operations for multiple find/replaces (but, where I want to be more manual than the "Find and Replace" tool in the editor):

1) Copy the replacement text to my pasteboard.  For this issue, let's say that is a single opening delimiter (e.g. `[`)

2) Select the text I want to replace, and press cmd-e

3) Quickly and repeatedly press cmd-g, then cmd-v to find the next occurrence, briefly visually inspect that it's what I want to replace, and then paste the replacement.

But, if the text I want to paste (copied in step 1) is an opening delimiter, then each paste in step 3 doesn't replace what I want, but instead it surrounds the selected text with those delimiters.

Expected Results:
I expect the selected text to always be replaced by what I am pasting, no matter what the content is that I am pasting.

Observed Results:
The selected text remains, and is surrounded by the delimiters.

Version:
Version 9.0 beta (9M136h)
macOS 10.12.5 (16F73)