The TextMate grammars for inline templates and inline styles ended the
string at the first occurrence of the delimiter, so an escaped delimiter
(e.g. \`) terminated the highlighting prematurely and the rest of the
template was no longer highlighted as HTML.
Escape sequences are now consumed before delegating to the HTML/CSS
grammars, so escaped delimiters no longer end the string. Also removes
the stray pipes from the string delimiter character class, which
unintentionally matched a literal '|'.
Fixes#65493
aparziale