Lark-based LaTeX parser: feedback on Issues #29488, #29467 and PR #29489

[Suraj Channappanavar]

Hi ,

I am Suraj Channappanavar,  I wanted to bring attention to a couple of issues and PR I have opened related to the Lark-based LaTeX parser:

Issue #29488 reports a bug where \left is incorrectly parsed as LTE due to a prefix conflict in the Lark grammar. 

PR #29489 fixes the above by adding a negative lookahead to the LTE token definition so \le only matches when not followed by a letter. 

Issue #29467 reports a bug on NOT_EQUAL token. I included a proposed fix in the issue description, and PR #29479 was opened by another contributor implementing the same fix.  

I would appreciate any feedback on the approach taken in PR #29489, and whether Issue #29467 needs further action from my side.

Thanks