[Rd] Bug in help(). (PR#10859)

[r.turner at auckland.ac.nz]

There appears to be a bug in help() when there are multiple packages  
attached
containing functions with the same name, and offline=TRUE.

Example:

	library(mgcv)
	library(gam)

If one simply does:

	help(gam) # No ``offline=TRUE''

then the following message appears:

Help on topic 'gam' was found in the following packages:

   Package               Library
   mgcv                  /Library/Frameworks/R.framework/Resources/ 
library
   gam                   /Users/rturner/Rlib

and a small chooser-menu window pops up to permit one to select the  
package to be referred to.

However if one does

	help(gam,offline=TRUE)

then the message about multiple packages appears, immediately  
followed by

Error in titles[i] <- if (inherits(tmp, "try-error")) "unknown title"  
else tmp[tools::file_path_sans_ext(tmp$File) ==  :
   nothing to replace with

(and no chooser-menu window pops up).

Session info:

R version 2.6.2 (2008-02-08)
i386-apple-darwin8.10.1

locale:
C

attached base packages:
[1] splines   stats     graphics  grDevices utils     datasets  methods
[8] base

other attached packages:
[1] mgcv_1.3-29 gam_0.98    misc_0.0-2

loaded via a namespace (and not attached):
[1] rcompgen_0.1-17 tcltk_2.6.2     tools_2.6.2


		cheers,

			Rolf Turner



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