[PATCH wayland] protocol: specify behavior of get_pointer when capabilities change

[Peter Hutterer]

Also applies to touch/keyboard

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 protocol/wayland.xml | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index f9e6d76..370fafc 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -1350,6 +1350,24 @@
 	This is emitted whenever a seat gains or loses the pointer,
 	keyboard or touch capabilities.  The argument is a capability
 	enum containing the complete set of capabilities this seat has.
+
+	When the pointer capability is added, a client may create a
+	wl_pointer object using the wl_seat.get_pointer request. This object
+	will receive pointer events until the capability is removed in the
+	future.
+
+	When the pointer capability is removed, a client should destroy the
+	wl_pointer objects associated with the seat where the capability was
+	removed, using the wl_pointer.release request. No further pointer
+	events will be received on these objects.
+
+	If a seat regains the pointer capability and a client has a pointer
+	object obtained previously, that object may start sending pointer
+	events. This behavior is implementation-dependent and must not be
+	relied upon.
+
+	The above behavior also applies to wl_keyboard and wl_touch with the
+	keyboard and touch capabilities, respectively.
       </description>
       <arg name="capabilities" type="uint" enum="capability"/>
     </event>
@@ -1360,7 +1378,9 @@
 	for this seat.
 
 	This request only takes effect if the seat has the pointer
-	capability.
+	capability, or has had the pointer capability in the past.
+	It is a protocol violation to issue this request on a seat that has
+	never had the pointer capability.
       </description>
       <arg name="id" type="new_id" interface="wl_pointer"/>
     </request>
@@ -1371,7 +1391,9 @@
 	for this seat.
 
 	This request only takes effect if the seat has the keyboard
-	capability.
+	capability, or has had the keyboard capability in the past.
+	It is a protocol violation to issue this request on a seat that has
+	never had the keyboard capability.
       </description>
       <arg name="id" type="new_id" interface="wl_keyboard"/>
     </request>
@@ -1382,7 +1404,9 @@
 	for this seat.
 
 	This request only takes effect if the seat has the touch
-	capability.
+	capability, or has had the touch capability in the past.
+	It is a protocol violation to issue this request on a seat that has
+	never had the touch capability.
       </description>
       <arg name="id" type="new_id" interface="wl_touch"/>
     </request>
-- 
2.5.0