ggplot2: x-axis scale now available on all facet-columns

One of the most annoying features of ggplot2 was the missing x-axis scale on facet-plots with some shorter columns.

To illustrate the problem see the following (pre-2.2-version) example:

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library(ggplot2)
 
ggplot(data=iris, aes(x=Sepal.Length, y=Sepal.Width)) +
  geom_point() +
  facet_wrap(~Species, nrow=2)

As you can see the scale of the x-axis under the second, shorte column is missing.

But with version 2.2.0 of ggplot2 this problem is solved:

If you ask how to install an older version of a package:

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library(devtools)
install_version("ggplot2", version = "2.1.0", repos = "http://cran.r-project.org")