Show field usage in charts history
I would like to know if a field is being used in any charts and where they are being used.
This helps when I'm modifying the field and need to account for all the scenarios that the field is used in.
Also, when I want to delete the field, I would like to first know if it's still being used. I can currently work around this by deleting the field and see which charts show an error. Works, but not ideal.
Some ideas are:
-show count of charts that field is being used in; where zero would mean that field is not used
-when the field is selected under the Fields panel, indicate which charts they are used in (ie. highlight the chart)