Fix missing default setting for angles in element_grob.element_text(). Closes #2544.

[clauswilke]

This closes #2544.

library(ggplot2)                                                                                                                                                       
ggplot(iris, aes(x = Sepal.Length, y = Petal.Length, color = Species)) +                                                                                               
  geom_point() +                                                                                                                                                         
  scale_color_discrete(guide = guide_legend(label.theme = element_text(face = "italic")))                                                                                

ggplot(iris, aes(x = Sepal.Length, y = Petal.Length, color = Species)) +                                                                                               
  geom_point() +                                                                                                                                                         
  scale_color_discrete(guide = guide_legend(title.theme = element_text(face = "italic")))     

Both examples look a bit weird because the font size isn't specified. Once we specify font size as well, things look as expected.

[hadley]

Thanks!

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