Martin Dobias d91e12d417 Fix missing min/max values for classification when changing datasets
The min/max values were stored in the color ramp shader, but to my surprise
these values were never persisted or copied: pseudo-color raster renderer
has a separate storage for the min/max values, so we need that for mesh renderer
as well.

The QgsRasterShaderFunction is not really useful, and QgsColorRamp should not
be derived from it, making things just more confusing.
2018-08-17 09:34:41 +02:00
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