In ggplot2, the coord_fixed() coordinate system ensures that the aspect ratio of the data is maintained at a given value. So, the shape of the panel changes to maintain the shape of the data. Meanwhile coord_flip() swaps the axes of the plot. However, a plot in ggplot2 must have exactly one coordinate system, so these functions cannot be combined.

My question is:

Does there exist a way to combine the behaviours of coord_fixed() and coord_flip(), resulting in a coordinate system with the x and y axes exchanged and a fixed aspect ratio of the data?

This is a popular question, however the common answer is incorrect:

The commonly suggested answer is to use coord_flip() together with theme(aspect.ratio = 1) instead of coord_fixed(). However, as per the ggplot2 documentation, this setting refers to the "aspect ratio of the panel." Thus, the data will change shape to maintain the shape of the panel.

I suspect that this is a feature that does not currently exist in ggplot2. But more importantly I think that a correct solution or at least response to this question should be documented.

Quick minimal example of the issue: