Chart limited to two categorical dimensions per axis #493
Description
I am experiencing an issue where GraphicWalker limits the Rows/Columns shelves to a maximum of two dimensions per axis. When I attempt to drag a third categorical dimension onto the axis, it automatically replaces the second dimension rather than nesting it (i.e., it swaps the field instead of adding a new hierarchy level).
I'm not sure this is by design; a previous issue #344 has it labelled as a bug that was subsequently fixed, but the issue is present in the current version of https://graphic-walker.kanaries.net/
Is this a hard limitation of the underlying Vega-Lite grammar, or is this a UI constraint that can be adjusted? If deep nesting/grouping/clustering (3+ levels) is not supported, official documentation or a warning or visual cue that the field will be swapped rather than added would be helpful to prevent user confusion.
The ability to add many hierarchical categorical dimensions on the x and y-axes (as well as tooltip/legend dimensions), and easily nesting them all as categorical rows of a bar graph, is an important feature of Tableau I am hoping to find an open source alternative for.