Bug#680514: LibreOffice Writer causing more lockups

[Alan Chandler <alan@chandlerfamily.org.uk>]

Since filing the report that suggests that horizontal scrolling with 
LibreOffice calc would almost immediately cause this bug to trigger, I 
have two further points to remark

1) Doing the same test in gnumeric does not fail - and I tried quite 
hard to make it do so

2) I have had two lockups almost immediately after opening a document in 
libreoffice writer and attempting vertical scrolling.  I think this is 
significant because
a) I have had no other lockups from any other applications
b) This is almost the only time I have opened a document recently.

I presume libreoffice has some specific way it is driving the x-server 
which makes it affect the server in this way.