In order to always show the best possible colors for visible categories it is sometimes desirable to automatically re-assign colors to the currently visible set of categories. Since this it is potentially confusing it has to be an option. It could be either a state or a command that are applied at a particular point. Further investigation is needed to determine which option is the best.
This is a good idea, but there's one issue (I guess it is the "potentially confusing" part): If you have multiple visualisations which show the same categories, the colors could be different in different visualisations. When these visusalisations are on the same page, this would indeed be confusing. I've been writing a (rather complex) script some time ago which harmonises the colors across visualisations on a page using well differentiable colors, so in principle some of the confusion can be avoided.
This would be nice. Currently if i have a category with over 100 unique values, but it will always be filtered to what is needed, so say for example 10 categories. In all visualizations, those 10 categories seem to always be same color, different shade of color, not as vibrant, or just ugly. It will be nice if a filter changes, it reassigns the colors of the category for every visualization within the same filtering scheme so that all visualizations will always show those vibrant, distinct colors.