text: Add commit request

Allows for atomic state changes. Updated surrounding text, content type
and micro focus is taken into account all at once at commit.

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

protocol/input-method.xml

@@ -131,6 +131,7 @@
       <arg name="button" type="uint"/>
       <arg name="index" type="uint"/>
     </event>
+    <event name="commit"/>
   </interface>
 
   <interface name="input_method" version="1">

protocol/text.xml

@@ -138,6 +138,8 @@
       <arg name="button" type="uint"/>
       <arg name="index" type="uint"/>
     </request>
+    <request name="commit">
+    </request>
     <event name="commit_string">
       <description summary="commit">
         Notify when text should be inserted into the editor widget. The text