xC/xP: relay and render channel topics

xC-proto

@@ -53,12 +53,12 @@ struct EventMessage {
 	u32 event_seq;
 	union EventData switch (enum Event {
 		PING,
+		BUFFER_LINE,
 		BUFFER_UPDATE,
 		BUFFER_STATS,
 		BUFFER_RENAME,
 		BUFFER_REMOVE,
 		BUFFER_ACTIVATE,
-		BUFFER_LINE,
 		BUFFER_CLEAR,
 		SERVER_UPDATE,
 		SERVER_RENAME,
@@ -69,41 +69,6 @@ struct EventMessage {
 	case PING:
 		void;
 
-	case BUFFER_UPDATE:
-		string buffer_name;
-		bool hide_unimportant;
-		union BufferContext switch (enum BufferKind {
-			GLOBAL,
-			SERVER,
-			CHANNEL,
-			PRIVATE_MESSAGE,
-		} kind) {
-		case GLOBAL:
-			void;
-		case SERVER:
-			string server_name;
-		case CHANNEL:
-			string server_name;
-		case PRIVATE_MESSAGE:
-			string server_name;
-		} context;
-	case BUFFER_STATS:
-		string buffer_name;
-		// These are cumulative, even for lines flushed out from buffers.
-		// Updates to these values aren't broadcasted, thus handle:
-		//  - BUFFER_LINE by bumping/setting them as appropriate,
-		//  - BUFFER_ACTIVATE by clearing them for the previous buffer
-		//    (this way, they can be used to mark unread messages).
-		u32 new_messages;
-		u32 new_unimportant_messages;
-		bool highlighted;
-	case BUFFER_RENAME:
-		string buffer_name;
-		string new;
-	case BUFFER_REMOVE:
-		string buffer_name;
-	case BUFFER_ACTIVATE:
-		string buffer_name;
 	case BUFFER_LINE:
 		string buffer_name;
 		// Whether the line should also be displayed in the active buffer.
@@ -150,6 +115,42 @@ struct EventMessage {
 		case FLIP_MONOSPACE:
 			void;
 		} items<>;
+	case BUFFER_UPDATE:
+		string buffer_name;
+		bool hide_unimportant;
+		union BufferContext switch (enum BufferKind {
+			GLOBAL,
+			SERVER,
+			CHANNEL,
+			PRIVATE_MESSAGE,
+		} kind) {
+		case GLOBAL:
+			void;
+		case SERVER:
+			string server_name;
+		case CHANNEL:
+			string server_name;
+			ItemData topic<>;
+		case PRIVATE_MESSAGE:
+			string server_name;
+		} context;
+	case BUFFER_STATS:
+		string buffer_name;
+		// These are cumulative, even for lines flushed out from buffers.
+		// Updates to these values aren't broadcasted, thus handle:
+		//  - BUFFER_LINE by bumping/setting them as appropriate,
+		//  - BUFFER_ACTIVATE by clearing them for the previous buffer
+		//    (this way, they can be used to mark unread messages).
+		u32 new_messages;
+		u32 new_unimportant_messages;
+		bool highlighted;
+	case BUFFER_RENAME:
+		string buffer_name;
+		string new;
+	case BUFFER_REMOVE:
+		string buffer_name;
+	case BUFFER_ACTIVATE:
+		string buffer_name;
 	case BUFFER_CLEAR:
 		string buffer_name;