[PATCH linux/vd-agent 10/11] clipboard: only send release when no immediate grab

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From: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>

Do not send a release event between two grabs, this helps with window
manager interaction issues on peer side.

Advertise this behaviour via a capability introduced in spice-protocol
0.12.16, so the client doesn't need to do some time-based filtering.

(the capability shouldn't need to be negotiated, a client shouldn't
expect a release between two grabs)

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
---
 src/vdagent/clipboard.c | 12 ++++++------
 src/vdagent/x11.c       |  7 +++----
 src/vdagentd/vdagentd.c |  1 +
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/src/vdagent/clipboard.c b/src/vdagent/clipboard.c
index 9fb87e3..097c6ee 100644
--- a/src/vdagent/clipboard.c
+++ b/src/vdagent/clipboard.c
@@ -242,13 +242,13 @@ static void clipboard_owner_change_cb(GtkClipboard        *clipboard,
         return;
     }
 
-    if (sel->owner == OWNER_GUEST) {
-        clipboard_new_owner(c, sel_id, OWNER_NONE);
-        udscs_write(c->conn, VDAGENTD_CLIPBOARD_RELEASE, sel_id, 0, NULL, 0);
-    }
-
-    if (event->reason != GDK_OWNER_CHANGE_NEW_OWNER)
+    if (event->reason != GDK_OWNER_CHANGE_NEW_OWNER) {
+        if (sel->owner == OWNER_GUEST) {
+            clipboard_new_owner(c, sel_id, OWNER_NONE);
+            udscs_write(c->conn, VDAGENTD_CLIPBOARD_RELEASE, sel_id, 0, NULL, 0);
+        }
         return;
+    }
 
     /* if there's a pending request for clipboard targets, cancel it */
     if (sel->last_targets_req)
diff --git a/src/vdagent/x11.c b/src/vdagent/x11.c
index c2515a8..9409b53 100644
--- a/src/vdagent/x11.c
+++ b/src/vdagent/x11.c
@@ -530,11 +530,10 @@ static void vdagent_x11_handle_event(struct vdagent_x11 *x11, XEvent event)
         if (ev.xfev.owner == x11->selection_window)
             return;
 
-        /* If the clipboard owner is changed we no longer own it */
-        vdagent_x11_set_clipboard_owner(x11, selection, owner_none);
-
-        if (ev.xfev.owner == None)
+        if (ev.xfev.owner == None) {
+            vdagent_x11_set_clipboard_owner(x11, selection, owner_none);
             return;
+        }
 
         /* Request the supported targets from the new owner */
         XConvertSelection(x11->display, ev.xfev.selection, x11->targets_atom,
diff --git a/src/vdagentd/vdagentd.c b/src/vdagentd/vdagentd.c
index 72a3e13..683e5d3 100644
--- a/src/vdagentd/vdagentd.c
+++ b/src/vdagentd/vdagentd.c
@@ -133,6 +133,7 @@ static void send_capabilities(struct vdagent_virtio_port *vport,
     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_MAX_CLIPBOARD);
     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_AUDIO_VOLUME_SYNC);
     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_GRAPHICS_DEVICE_INFO);
+    VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_CLIPBOARD_NO_RELEASE_ON_REGRAB);
     virtio_msg_uint32_to_le((uint8_t *)caps, size, 0);
 
     vdagent_virtio_port_write(vport, VDP_CLIENT_PORT,
-- 
2.21.0.4.g36eb1cb9cf

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