warn user when even.steps=FALSE is used with a discrete scale #3881
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This PR addresses #3877 without providing a true fix. The
even.steps = FALSEfeature piggybacks on theguide_colourbar()rendering which does not work on discrete scales. A complete rewrite of the functionality would be needed which is not a priority before the guide rewrite.This PR simply emits a warning about the feature not working for that particular case