Support for collapsing account trees in stacked bar chart

[pmarciniak]

While the stacked bar chart on the Income Statement page is awesome, it may be hard to use on complex multi-level account hierarchies. This is a feature request for allowing to collapse select account subtrees into a single entry in the chart. For example, I'd prefer to see a single entry for "Entertainment:Sport" rather than multiple entries for many small, fragmented subaccounts like "Entertainment:Sport:Cycling:Gravel".

I think the most user-friendly way of achieving this would be for the chart to instantly react to the user collapsing or expanding subtrees in the account tree below. That way it would be super easy to get a coarse-grained overview of expenses and then quickly drill down if some high-level category seems bigger than expected.

Should the above behavior be prohibitively hard to implement, I think having the chart statically respect the collapse-pattern settings would already be a step in the right direction usability-wise.

Unfortunately, I'm not able to contribute a PR, but leaving this here for documentation purposes and to gauge interest from other people who would find such feature useful. So please +1, people!