text: Split out cursor_position

Add an extra cursor_position, which also allows to change the anchor
(for slections). Change the index type to int to allow setting it before
the beginning of a commited string.

The cursor should not be moved as a direct repsonse to this event but
atomically on the next commit_string event.

Signed-off-by: Jan Arne Petersen <jpetersen@openismus.com>

protocol/input-method.xml

@@ -41,7 +41,6 @@
       </description>
       <arg name="serial" type="uint"/>
       <arg name="text" type="string"/>
-      <arg name="index" type="uint"/>
     </request>
     <request name="preedit_string">
       <description summary="pre-edit string">
@@ -70,6 +69,11 @@
       <arg name="index" type="int"/>
       <arg name="length" type="uint"/>
     </request>
+    <request name="cursor_position">
+      <arg name="serial" type="uint"/>
+      <arg name="index" type="int"/>
+      <arg name="anchor" type="int"/>
+    </request>
     <request name="modifiers_map">
       <arg name="map" type="array"/>
     </request>

protocol/text.xml

@@ -161,7 +161,6 @@
       </description>
       <arg name="serial" type="uint"/>
       <arg name="text" type="string"/>
-      <arg name="index" type="uint"/>
     </event>
     <event name="preedit_string">
       <description summary="pre-edit">
@@ -186,6 +185,15 @@
       <arg name="index" type="int"/>
       <arg name="length" type="uint"/>
     </event>
+    <event name="cursor_position">
+      <description summary="set cursor to new position">
+        Notify when the cursor or anchor position should be modified. It
+        should take effect after the next commit_string event.
+      </description>
+      <arg name="serial" type="uint"/>
+      <arg name="index" type="int"/>
+      <arg name="anchor" type="int"/>
+    </event>
     <enum name="preedit_style">
       <entry name="default" value="1"/>
       <entry name="active" value="2"/>