Math Mode: Syntax Highlighting of Escaped Curly Bracket Fails

[sanssecours]

This bug was reported via email (sent in by Michael Sheets).

The highlighting for the following code is incorrect:

 $\{sometext\}$

Expected result: \{ and \} have the same highlighting.
Actual result: \{ and \} have different highlighting

The issue is ‘constant.numeric.math.tex’ in the Tex grammar, I just don’t know which is wrong matched/not matched.