Summary:
Bar chart was a bit broken when there were redundant values on the X axis: the bars’s height maps to the sum of all the corresponding y values, when the data that shows up on hover is only the last one.
It seems that plotly does not support redundant values in the x axis and in all Plotly examples (implementation relies on plotly) x values only have unique values.
This diff, fixes by making sure x axis has unique values. If user actually wants to plot groups, they'll have to use a summary charts.
Test Plan: tested manually
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D3011