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ba59640ab2
Unrolling a bounded quantifier {min,max} into (max-min) optional Split
chains lets the backtracker explore O(2^n) paths, which quickly
exhausts the backtrack limit for large bounds.
Fix this by compiling the optional tail via a RepeatStart/RepeatCheck
counted loop when the atom is known to be non-zero-width. The loop
is safe to use without a progress check precisely because the atom
cannot match empty.
This required making atom_can_be_zero_width recursive into group bodies:
previously it conservatively returned true for all Group and
NonCapturingGroup atoms, so the non-zero-width guard could never fire
for grouped subexpressions.
The old lowering triggered "Regular expression backtrack limit exceeded"
for patterns like /'(?:\\(?:\r\n|[\s\S])|[^'\\\r\n]){0,32}'/, causing
inputs that should match normally (or return null) to throw instead.
Fixes syntax highlighting of the C++ API on https://blend2d.com