[R-SIG-Mac] arguments lookup is disabled while R is busy

[Brandon Hurr]

The code hints appear to be not working properly for me. In both the
editor window and in R GUI I see the subject line in parentheses
rather than the usual helpful text indicating what variables are
acceptable in a particular function.
Tab autocompletion is also non-functioning.

Any pointers?

Thanks,
Brandon

https://i.imgur.com/QiAq0W9.png

> devtools::session_info()
Session info ----------------------------------------------------------------------------------
 setting  value
 version  R version 3.2.2 (2015-08-14)
 system   x86_64, darwin13.4.0
 ui       AQUA
 language (EN)
 collate  en_US.UTF-8
 tz       America/Los_Angeles
 date     2015-08-26

Packages --------------------------------------------------------------------------------------
 package    * version     date       source
 assertthat   0.1         2013-12-06 CRAN (R 3.2.0)
 colorspace   1.2-6       2015-03-11 CRAN (R 3.2.0)
 DBI          0.3.1       2014-09-24 CRAN (R 3.2.0)
 devtools   * 1.9.0       2015-08-25 Github (hadley/devtools at 76ada1d)
 digest       0.6.8       2014-12-31 CRAN (R 3.2.0)
 dplyr      * 0.4.2.9002  2015-08-25 Github (hadley/dplyr at 70b74de)
 ggplot2    * 1.0.1.9003  2015-08-25 Github (hadley/ggplot2 at e023c24)
 gtable       0.1.2       2012-12-05 CRAN (R 3.2.0)
 labeling     0.3         2014-08-23 CRAN (R 3.2.0)
 lazyeval     0.1.10.9000 2015-05-26 Github (hadley/lazyeval at ecb8dc0)
 magrittr     1.5         2014-11-22 CRAN (R 3.2.0)
 memoise      0.2.1       2014-04-22 CRAN (R 3.2.0)
 munsell      0.4.2       2013-07-11 CRAN (R 3.2.0)
 plyr         1.8.3       2015-06-12 CRAN (R 3.2.0)
 R6           2.1.0       2015-07-04 CRAN (R 3.2.0)
 Rcpp         0.12.0      2015-07-25 CRAN (R 3.2.0)
 readxl     * 0.1.0.9000  2015-08-25 Github (hadley/readxl at 7c7f66b)
 reshape2     1.4.1       2014-12-06 CRAN (R 3.2.0)
 rstudioapi   0.3.1       2015-04-07 CRAN (R 3.2.0)
 scales       0.3.0.9000  2015-08-25 Github (hadley/scales at 7fc502c)
 stringi      0.5-5       2015-06-29 CRAN (R 3.2.0)
 stringr      1.0.0       2015-04-30 CRAN (R 3.2.0)