[rfc][icedtea-web] Make applet resize message handling asynchronous

[Adam Domurad]

Hi, this is a defensive patch to remove deadlock possibility entirely 
from the applet resizing message. I think as much as it can be avoided, 
blocking operations should not occur on the worker threads. We never 
make more than 2 worker threads for normal messages, so they should 
spawn a thread for any task that will potentially take a substantial time.

ChangeLog:
2013-XX-XX  Adam Domurad  <adomurad at redhat.com>

     * plugin/icedteanp/java/sun/applet/PluginAppletViewer.java:
     Handle resizing more robustly by not blocking worker thread

I am also writing this little page: 
http://icedtea.classpath.org/wiki/Fixing_IcedTea-Web_Browser_Hanging
Comments welcome. It is linked from the icedtea-web wiki page under 
'Common problems'.

Happy hacking,
-Adam
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