Claus Wilke

The fundamental problem here is that grid graphics cannot draw lines with continuously varying colors, so `geom_path()` simply breaks the line into individual segments and draws those. You can simulate...

A proposed implementation was submitted here: #4560 @aijordan Since you already made a PR there's no need to close it unless you feel it has a problem or discussion/review arrives...

@teunbrand Could you provide an example of what this would do and how it would work?

What blocks the ticks is that the graticule lines don't intersect with the plot boundaries. To draw ticks for any sort of strange, non-linear coordinate system the only reasonable way...

I would be worried that there are many cases in which it could go wrong, in particular since the limits will depend on the CRS in which the geometries are...

In my opinion this is a good idea in principle but not at all easy to implement, and you may create all sorts of additional expectations by providing this feature....

The issue is still open, as far as I can tell. If somebody would like to contribute a PR, we'd certainly review it. It didn't make sense to tackle this...

Bar plots are for categorical data, histograms for numerical data. You're trying to make a bar plot from numerical data. That makes no sense. Try `geom_histogram()` or turn your data...

I have re-read all the comments from https://github.com/tidyverse/ggplot2/issues/3116#issuecomment-465756191 down and it looks to me that we never got to a better solution than adding `layer_params`, though it was still unclear...

I guess we need an executive decision. @thomasp85 Can you make the call? And should the theme be part of the layout or be handled separately?