Duplicate x-axis label with 'category ascending'

[john-soklaski]

Repro at:
https://codepen.io/john-soklaski/pen/QEoJAz

When the xaxis in this example has categoryorder: 'category ascending' set, there is a duplicate '1' on the xaxis, if it is not set, the duplicate label no longer appears.

[john-soklaski]

I think this is due to an off by one error in flattenUniqueSort. Fix at master...john-soklaski:category_ascending_bug

[etpinard]

Thanks for the report. Confirmed.

At first glance your fix looks appropriate. Categorical ordering is tested here. Would you mind testing that suite by running:

npm run test-jasmine -- tests/calcdata_test.js

and see that it doesn't break anything?

If the tests pass, PR away 🚀