[Rd] X11 protocol errors after all x11 devices are closed (PR#1065)

[maechler@stat.math.ethz.ch]

>>>>> "BDR" == Brian D Ripley <ripley@stats.ox.ac.uk> writes:

    >> x11()
    >> dev.off()
    BDR> null device
    BDR> 1
    >> x11()
    >> plot.new()
    BDR> Warning messages:
    BDR> 1: X11 protocol error: BadAccess (attempt to access private resource denied)
    BDR> 2: X11 protocol error: BadAccess (attempt to access private resource denied)

    BDR> This only happens if all x11 devices are shut down, so the X11 connection
    BDR> is restarted.  We had problems with this when the event handlers
    BDR> were changed prior to 1.3.0, and it looks as if the logic is still
    BDR> incorrect.

    BDR> As far as I can see subsequent plots are correct.

    BDR> Carrying on:

    >> dev.off()
    BDR> null device
    BDR> 1
    >> x11()
    >> plot.new()
    BDR> Warning message:
    BDR> X11 protocol error: BadAccess (attempt to access private resource denied)
    BDR> (only one error this time).

Just this morning,
I found (again!, we had something close to this before) 
the following related bugous behavior :
After interrupting a plot (which would have taken a few minutes and was
"wrong" anyway), starting another plot, interrupting again [with C-c],
and maybe the same once more,
R started just giving a ">" prompt
but did not react any further at all.
(C-c would return the prompt, but no other reaction was possible)
Only killing the R process helped.

I may try to reproduce more exactly later today.
Martin

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