Enable Stacked Bar Chart #enhancement

[xychang]

Description

Enable stacked bar chart when user set stack to true.
Currently only works with all positive or all negative numbers.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• If this is a bug fix, did you add or update a test file to the examples directory that verifies the bug is fixed?
• If this is a new feature, did you add files to the examples directory to demonstrate the feature?
• If this is a new feature, did you add documentation to the docs directory for the feature?

[lazyguru]

Just a minor nitpick and I'll fix this after the merge, but please try to avoid adding whitespace like this

[xychang]

Thanks for catching that!

[lazyguru]

Thanks for your contribution