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Some specific .less lines take very long to check

See original GitHub issue

This is probably not a bug but an inconvenient result of the hashing algorithm of the rabin-karp algorithm. I had twelve lines in one .less file slow down my checks from 4.5 seconds to 250 seconds. Solved it by adding this specific .less file to the ignore list. These lines were the culprit for me:

@1dp_elevation: 0px 1px 1px 0px rgba(0, 0, 0, .14), 0px 2px 1px -1px rgba(0, 0, 0, .12), 0px 1px 3px 0px rgba(0, 0, 0, .2);
@2dp_elevation: 0px 2px 2px 0px rgba(0, 0, 0, .14), 0px 3px 1px -2px rgba(0, 0, 0, .12), 0px 1px 5px 0px rgba(0, 0, 0, .2);
@3dp_elevation: 0px 3px 4px 0px rgba(0, 0, 0, .14), 0px 3px 3px -2px rgba(0, 0, 0, .12), 0px 1px 8px 0px rgba(0, 0, 0, .2);
@4dp_elevation: 0px 4px 5px 0px rgba(0, 0, 0, .14), 0px 1px 10px 0px rgba(0, 0, 0, .12), 0px 2px 4px -1px rgba(0, 0, 0, .2);
@6dp_elevation: 0px 6px 10px 0px rgba(0, 0, 0, .14), 0px 1px 18px 0px rgba(0, 0, 0, .12), 0px 2px 4px -1px rgba(0, 0, 0, .2);
@8dp_elevation: 0px 8px 10px 0px rgba(0, 0, 0, .14), 0px 3px 14px 2px rgba(0, 0, 0, .12), 0px 5px 5px -3px rgba(0, 0, 0, .2);
@9dp_elevation: 0px 9px 12px 1px rgba(0, 0, 0, .14), 0px 3px 16px 2px rgba(0, 0, 0, .12), 0px 5px 6px -3px rgba(0, 0, 0, .2);
@12dp_elevation: 0px 12px 17px 2px rgba(0, 0, 0, .14), 0px 5px 22px 4px rgba(0, 0, 0, .12), 0px 7px 8px -4px rgba(0, 0, 0, .2);
@16dp_elevation: 0px 16px 24px 2px rgba(0, 0, 0, .14), 0px 6px 30px 5px rgba(0, 0, 0, .12), 0px 8px 10px -5px rgba(0, 0, 0, .2);
@24dp_elevation: 0px 24px 38px 3px rgba(0, 0, 0, .14), 0px 9px 46px 8px rgba(0, 0, 0, .12), 0px 11px 15px -7px rgba(0, 0, 0, .2);