[Xcb] ConfigureWindow XML change

[Eamon Walsh]

xcb/proto commit 57934c introduced the "value-mask-pad" attribute to fix 
the ConfigureWindow request and it's unique, problematic 2-byte 
value-mask field.

However it was still broken in xpyb (the pad was in the wrong place), 
prompting
http://bugs.freedesktop.org/show_bug.cgi?id=24507

I was able to fix it harder by reverting 57934c and instead simply 
defining the value-mask-length field early and then the pad bytes:

    <request name="ConfigureWindow" opcode="12">
      <pad bytes="1" />
      <field type="WINDOW" name="window" />
+<field type="CARD16" name="value_mask" />
+<pad bytes="2" />
      <valueparam value-mask-type="CARD16"
                  value-mask-name="value_mask"
                  value-list-name="value_list" />

This change shouldn't be a huge deal because defining a length field 
early happens all the time with lists (the Python parser treats 
valueparams as lists which is why this works).  But this could in theory 
affect other parsers/bindings, so I wanted to give a heads-up.



-- 
Eamon Walsh<ewalsh at tycho.nsa.gov>
National Security Agency