xinput: req UngrabDeviceButton.modifier_device: altenum

add altenum ModifierDevice to field modifier_device for value UseXKeyboard

spec and code:
http://cgit.freedesktop.org/xorg/lib/libXi/tree/specs/encoding.xml#n1225
http://cgit.freedesktop.org/xorg/proto/inputproto/tree/XI.h#n187
http://cgit.freedesktop.org/xorg/xserver/tree/Xi/ungrdevb.c#n111

the following spec uses "NULL" instead of "UseXKeyboard":
http://cgit.freedesktop.org/xorg/proto/inputproto/tree/specs/XIproto.txt#n1386
Questions:
* is this spec wrong?
* or does "NULL" have the unusual value of 0xff in this context?

diff --git a/src/xinput.xml b/src/xinput.xml
index 6538726..29758a2 100644 (file)
--- a/src/xinput.xml
+++ b/src/xinput.xml
@@ -413,7 +413,7 @@ authorization from the authors.
     <request name="UngrabDeviceButton" opcode="18">
         <field type="WINDOW" name="grab_window" />
         <field type="CARD16" name="modifiers" mask="ModMask" />
-        <field type="CARD8"  name="modifier_device" />
+        <field type="CARD8"  name="modifier_device" altenum="ModifierDevice" />
         <field type="CARD8"  name="button" altenum="Grab" />
         <field type="CARD8"  name="grabbed_device" />
         <pad bytes="3" />