Broken TonalPalette equality operator in dart

[KalilDev]

In TonalPalette, when one of the palettes was not generated using the _fromHueAndChroma operator, the following code is called:

material-color-utilities/dart/lib/palettes/tonal_palette.dart

Line 113 in dfc3fae

return _cache.values.toSet().containsAll(other._cache.values);

. The issue is that when one of the palettes's cache was not filled, the comparision results in a empty set contains an empty set, for example. This results in operator== resulting in true, always, even when the palettes are different. An testcase for this it https://github.com/kalildev/material_color_utilities_issue .

[guidezpl]

Thanks for filing an issue and for the test case, I'll get a fix out shortly.