Allow for # in fragments because some clients send matrix.to links like that

src/Config.h

@@ -61,7 +61,9 @@ inline const QRegularExpression url_regex(
                         general_unicode + ")*))";
       const auto query = R"(((?:[a-zA-Z0-9\-._~!$&'*+,;=:@/?\\{}]|)" + pct_enc +
                          R"(|\((?-1)\)|\[(?-1)\]|)" + general_unicode + ")*)";
-      const auto &fragment = query;
+      // explicitly allow # in fragments because of matrix.to urls generated by some clients...
+      const auto fragment = R"(((?:[a-zA-Z0-9\-._~!$&'*+,;=:@/?\\{}#]|)" + pct_enc +
+                            R"(|\((?-1)\)|\[(?-1)\]|)" + general_unicode + ")*)";
       return R"((?<!["'\w])(?>()" + protocol + "://" + "(?:" + userinfo + "@)?" + host +
              "(?::[0-9]+)?" + path +
              "?"