[Rd] X11 redraw events dropped? (PR#8250)

[keith@nissimo.net]

Full_Name: Keith Frost
Version: 2.1.0
OS: Debian Sarge
Submission from: (NULL) (66.162.141.10)


This has actually been a problem for some time in R under Linux. (I noticed 
it under previous builds for Redhat 9 as well.)  The graphics device windows
produced by the x11() function do not always get redrawn when they should, 
sometimes leaving the device blank when there should be a graph on it.  
I do not know for sure that this is an R-specific problem (I suppose the 
window manager could be failing to pass along the correct redraw information), 
but I thought I'd try to find out if other people are experiencing it, and 
if it can be tracked down and fixed.

To reproduce:

Bring up a number of plots with the x11() function, and graph things on them.  
Move 
other windows to cover, and then reveal, the various plot windows, until -- one
or more
of your graphs disappears.  Move the graphs over each other to get the graphs to
come
back.   Etc.