Python: case wildcard missed after a continuation line at column 0 #241

Applies to the PyCaseWildcardPattern added in #236 (not on main yet).

A wildcard _ is missed when a statement in the previous case body continues onto a line at column 0, either inside brackets or after a \. The pattern finds the enclosing block by indentation, so it reads that continuation line as the enclosing block instead of the match.

Steps to reproduce

use Tempest\Highlight\Highlighter;

echo (new Highlighter())->parse("match command:\n    case 1:\n        y = foo(\n1)\n    case _:\n        pass", 'python');

Expected

case <span class="hl-keyword">_</span>:. Python's ast parses the second clause as MatchAs(), a wildcard.

Actual

case _:, with no highlighting.

Notes

• y = 1 + \ followed by 2 at column 0 fails the same way.
• With normal indentation (foo(\n 1)) the wildcard is highlighted.
• A possible fix: track bracket depth and \ continuations in the existing lexing pass, and skip lines that start inside them.