[Rd] tk + browser() can leave R unresponsive

[Scott Kostyshak]

I don't know if this is a bug. I can reproduce the following on Ubuntu
12.04.2 and 13.04 64-bit with R version 3.0.1 and with r63479. There
is no difference if R is patched with the fix for PR#15407 or not,
although without the fix there are more ways to trigger this.

I can reproduce with the following:

1. Open R in gnome-terminal or xterm

2. Run 'library(tcltk)'

3. Run 'trace(tk_select.list, edit = TRUE)'
and put "browser()" at the beginning of the onOK body (e.g. in Vim run
<<:g/onOK/put ='browser()'>>). That is, transform

    onOK <- function() {
        res <- 1L + as.integer(tkcurselection(box))
        cat("res is: ", res)
        ans.select_list <<- choices[res]
        tkgrab.release(dlg)
        tkdestroy(dlg)
    }

to:

    onOK <- function() {
        browser()
        res <- 1L + as.integer(tkcurselection(box))
        cat("res is: ", res)
        ans.select_list <<- choices[res]
        tkgrab.release(dlg)
        tkdestroy(dlg)
    }

4. Run 'install.packages()'

5. Double-click on a package

R becomes unresponsive and I have to kill it.

> sessionInfo()
R Under development (unstable) (2013-08-02 r63479)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

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

Scott


--
Scott Kostyshak
Economics PhD Candidate
Princeton University