[Rd] alpha transparency doesn't work for lines when xpd=TRUE

[David Winsemius]

> On Apr 16, 2018, at 10:41 AM, Jiaxuan Chen <Jiaxuan.Chen at cruk.cam.ac.uk> wrote:
> 
> Dear R-devel,
> 
> I think I've found a bug - the alpha transparency doesn't work when plotting lines with xpd = TRUE.
> 
> #works
> plot(1:20, col="#1874CD", xpd=T, type="l")
> 
> #works
> plot(1:20, col="#1874CD50", xpd=F, type="l")
> 
> #doesn't work
> plot(1:20, col="#1874CD50", xpd=T, type="l")

It's behaving as expected (last two lines light blue) on a Mac (El Capitan) and R 3.4.3. (I did check to see if T and F were still TRUE and FALSE at the time. It's possible that they were not in your session. Only TRUE and FALSE are reserved words.)
> 
> Thank you.
> 
> Jim
> 
> 
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David Winsemius
Alameda, CA, USA

'Any technology distinguishable from magic is insufficiently advanced.'   -Gehm's Corollary to Clarke's Third Law