hadley/ggplot2 — comment on commit 42c1ed3f74a9acaa15a8d1058ded2217f2908ed5
File:  line 0
By hadley:

I'd rather have a setting to override the automatic detection of width and height in the case of single row or single column rasters. But all that code is pretty nasty, and I'm not sure if I'd rather leave it for the layers package to fix.