Special characters not recognised as the beginning of a word

[laurmurclar]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

A closing quote, bracket, etc. is added when an opening character is inserted in front of special characters (like #, !, €, etc). I believe this is a bug (or inconsistency with the intended behaviour) since alphanumeric characters do not have this behaviour. For example, if a single-quote is inserted in front of an alphanumeric character no closing single-quote is added.

You can see both behaviours in the below GIF:

Steps to Reproduce

1. Create a file which contains a word beginning with a special character (such as #).
2. Insert the opening character from an auto-completing pair (such as ') in front of the #.
3. Observe that the closing character from that pair is added by the auto-completion.
4. Insert the same opening character in front of a word beginning with an alpha-numeric character.
5. Observe that no closing character is added.

Expected behavior: No closing character is added.

Actual behavior: A closing character is added by auto-completion.

Reproduces how often: Always 💯

Versions

atom --version
Atom    : 1.21.1
Electron: 1.6.15
Chrome  : 56.0.2924.87
Node    : 7.4.0

apm --version
apm  1.18.5
npm  3.10.10
node 6.9.5 x64
python 2.7.13
git 2.12.0

sw_vers
ProductName:	Mac OS X
ProductVersion:	10.12.6
BuildVersion:	16G29

Additional Information

I found a similar issue which describes almost the same thing except existing openers are not being closed at the end of a word (which ends in a special character): #298

[laurmurclar]

I'm going to try solve this issue as part of Hacktoberfest 😄 I can't assign myself though, so leaving this comment instead