This message is not straight forward to grasp.
Not clear by the name why we need to wait other channels messages
before resetting the image cache.

Signed-off-by: Frediano Ziglio <fzig...@redhat.com>
---
 spice.proto | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/spice.proto b/spice.proto
index 76cfef2..8ce2654 100644
--- a/spice.proto
+++ b/spice.proto
@@ -736,6 +736,13 @@ channel DisplayChannel : BaseChannel {
        ResourceID resources[count] @end;
     } @ctype(SpiceResourceList) inval_list;
 
+    /* This message is used to invalidate the complete image cache
+     * on the client.
+     * Due to sunchronization for GLZ images we must make sure
+     * that messages related to cached images on other channels
+     * are processed so we send a list of channels with respective
+     * message serial to wait for.
+     */
     message {
        uint8 wait_count;
        WaitForChannel wait_list[wait_count] @end;
-- 
2.14.3

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