left margin of plot title is neglected

[benimwolfspelz]

I found a problem with the margins of plot titles: The left margin of a plot title seems to be ignored if it is specified via theme().

In the following examples, I would expect to see the plot title be indented in version B as compared to version A.

# version A:
ggplot(mtcars, aes(x = cyl, y = mpg)) +
  geom_point() +
  ggtitle("Version A: no margins specified")

# version B:
ggplot(mtcars, aes(x = cyl, y = mpg)) +
  geom_point() +
  ggtitle("Version B: left margin of 20mm expected") +
  theme(plot.title = element_text(margin = margin(l = 20, unit = "mm")))

This potential bug is also reported in this stackoverflow question (not mine).

[teunbrand]

Thanks for the report! You're right, these margins weren't working.
We first learned about it in #5533 and fixed the issue in the development version in #5545.
Because this has been fixed, I'll close this issue as completed; but we can reopen it if there is an issue with the current fix.