xwm: Claim the CLIPBOARD_MANAGER selection

src/xwayland/selection.c

@@ -521,6 +521,15 @@ weston_wm_handle_selection_request(struct weston_wm *wm,
 	wm->incr = 0;
 	wm->flush_property_on_delete = 0;
 
+	if (selection_request->selection == wm->atom.clipboard_manager) {
+		/* The weston clipboard should already have grabbed
+		 * the first target, so just send selection notify
+		 * now.  This isn't synchronized with the clipboard
+		 * finishing getting the data, so there's a race here. */
+		weston_wm_send_selection_notify(wm, wm->selection_request.property);
+		return;
+	}
+
 	if (selection_request->target == wm->atom.targets) {
 		weston_wm_send_targets(wm);
 	} else if (selection_request->target == wm->atom.timestamp) {
@@ -673,6 +682,11 @@ weston_wm_selection_init(struct weston_wm *wm)
 			  wm->screen->root_visual,
 			  XCB_CW_EVENT_MASK, values);
 
+	xcb_set_selection_owner(wm->conn,
+				wm->selection_window,
+				wm->atom.clipboard_manager,
+				XCB_TIME_CURRENT_TIME);
+
 	mask =
 		XCB_XFIXES_SELECTION_EVENT_MASK_SET_SELECTION_OWNER |
 		XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_WINDOW_DESTROY |

src/xwayland/window-manager.c

@@ -1000,6 +1000,7 @@ wxs_wm_get_resources(struct weston_wm *wm)
 		{ "_NET_SUPPORTED",     F(atom.net_supported) },
 		{ "_MOTIF_WM_HINTS",	F(atom.motif_wm_hints) },
 		{ "CLIPBOARD",		F(atom.clipboard) },
+		{ "CLIPBOARD_MANAGER",	F(atom.clipboard_manager) },
 		{ "TARGETS",		F(atom.targets) },
 		{ "UTF8_STRING",	F(atom.utf8_string) },
 		{ "_WL_SELECTION",	F(atom.wl_selection) },

src/xwayland/xwayland.h

@@ -107,6 +107,7 @@ struct weston_wm {
 		xcb_atom_t		 net_supported;
 		xcb_atom_t		 motif_wm_hints;
 		xcb_atom_t		 clipboard;
+		xcb_atom_t		 clipboard_manager;
 		xcb_atom_t		 targets;
 		xcb_atom_t		 utf8_string;
 		xcb_atom_t		 wl_selection;