[Rd] abline() does not obey "xpd" (clipping rules) (PR#750)

[maechler@stat.math.ethz.ch]

This is not a bug in the very strict sense,
but for consistency,  
I feel that
    abline() 
should obey  par("xpd") setting, even by ...-argument.
The following code shows how  lines() ``works'' and abline() does not :

  par(mfrow=c(2,1))
  plot(1:4)
  plot(1:10)
  par(xpd=NA); abline(v=1:10); par(xpd=FALSE)
  ## or even
  abline(v=1:10, xpd = NA, col = "purple")
  ## lines() *does* work with xpd arg:
  lines(4:5,c(1,40), col = 2, xpd = FALSE)# clip to plot
  lines(5:6,c(1,40), col = 3, xpd = TRUE)# clip to figure
  lines(6:7,c(1,20), col = 4, xpd = NA)# clip to device 
  text(4:6, 10.5, "xpd =", xpd = TRUE, col = 2:4)
  text(4:6, 10, c("FALSE","TRUE","NA"), col = 2:4, adj = 0)


Martin Maechler <maechler@stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><

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