Nested facet_wrap()

[teunbrand]

Basically the strip merging of facet_nested() but then in a facet wrap layout. Should be doable to adapt/clone + adapt the strip merging logic from facet_nested() to do the same to wrapped facets. Probably have to constrain the merging to panel rows/columns somehow. A limitation would be that when grouped panels are placed in seperate rows/column, there is no elegant merging of strips to be done.

There seems to be some demand for it:

• https://stackoverflow.com/questions/62652308/combine-multiple-facet-strips-across-columns-in-ggplot2-facet-wrap

• https://github.com/teunbrand/ggnomics/issues/5

[teunbrand]

This should now be possible:

library(ggh4x)
#> Loading required package: ggplot2

ggplot(mpg, aes(displ, hwy)) +
  geom_point() + 
  facet_nested_wrap(vars(cyl, drv))

^{Created on 2020-08-12 by the reprex package (v0.3.0)}