I cant reproduce this. 

But what syntax highlighting are you referring to? There's no syntax highlighting for a Plain text file, unless I'm missing something?

On Thu, 26 Dec 2019 at 21:03, Quinn Comendant <quinn@strangecode.com> wrote:
If I open a Plain Text window and paste in the following line of text, TextMate 2.0.3 CPU usage goes to 100% and never stops. Syntax highlighting ends at the line containing the text. Here's the string:

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;=


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