Bug: Glitches in Pretty Breaks graduated rendering

[Alister]

Sometimes using "Pretty Breaks" mode the graduated renderer creates unnecessary categories which are larger than the maximum value in the data. The biggest category still has the maximum value as its upper limit.

e.g. in the screenshot attached where the ZN column is used, the maximum value in the data is 1.58

in the screenshot where the CU column is used, the maximum value in the data is 0.145

Because so many extra columns are created in the CU example the effect on the map is much worse, as all the data ends up in a narrow slice of the colour ramp (all the data is be yellow).

I've joined most of the attribute data to some made up shapes and attached it for an example (a few of the shapes got deleted when using the "join attributes" tool for some reason, but it still has the same problems when using "Pretty Breaks").

[Alister]

Sometimes using "Pretty Breaks" mode the graduated renderer creates unnecessary categories which are larger than the maximum value in the data. The biggest category still has the maximum value as its upper limit.

Sorry, that explanation might not be clear enough. See the attached screenshots.