Handle divergent colormaps and improve singular value handling in colorbars #28999
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The updates made in the code improve handling of two key cases:
coolwarmorRdBu, singular values (wherevmin == vmax) now collapse to the center, ensuring smoother transitions, addressing Tim's concern.vminandvmaxif they are equal, avoiding abrupt changes and maintaining consistent behavior, without triggering warnings.These changes enhance flexibility and consistency across different colormap types.
Helps with issue #26307
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