AK: Make StringUtils::matches() handle escaping

Author: https://github.com/demostanis
Commit: aa788581f2
Pull-request: https://github.com/SerenityOS/serenity/pull/15195
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/Xexxa ✅
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/timschumi ✅

AK/StringUtils.cpp

@@ -59,6 +59,9 @@ bool matches(StringView str, StringView mask, CaseSensitivity case_sensitivity,
         case '?':
             record_span(string_ptr - string_start, 1);
             break;
+        case '\\':
+            ++mask_ptr;
+            break;
         default:
             auto p = *mask_ptr;
             auto ch = *string_ptr;