xC/xP: only send buffer stats in the initial sync

The client and frontends track these separately,
there is no need for hard synchronization.

xP/public/xP.js

@@ -136,6 +136,12 @@ let bufferCurrent = undefined
 let bufferLog = undefined
 let bufferAutoscroll = true
 
+function resetBufferStats(b) {
+	b.newMessages = 0
+	b.newUnimportantMessages = 0
+	b.highlighted = false
+}
+
 let connecting = true
 rpc.connect().then(result => {
 	buffers.clear()
@@ -162,15 +168,21 @@ rpc.addEventListener('Ping', event => {
 rpc.addEventListener('BufferUpdate', event => {
 	let e = event.detail, b = buffers.get(e.bufferName)
 	if (b === undefined) {
-		buffers.set(e.bufferName, {
-			lines: [],
-			newMessages: e.newMessages,
-			newUnimportantMessages: e.newUnimportantMessages,
-			highlighted: e.highlighted,
-		})
+		buffers.set(e.bufferName, (b = {lines: []}))
+		resetBufferStats(b)
 	}
 })
 
+rpc.addEventListener('BufferStats', event => {
+	let e = event.detail, b = buffers.get(e.bufferName)
+	if (b === undefined)
+		return
+
+	b.newMessages = e.newMessages,
+	b.newUnimportantMessages = e.newUnimportantMessages
+	b.highlighted = e.highlighted
+})
+
 rpc.addEventListener('BufferRename', event => {
 	let e = event.detail
 	buffers.set(e.new, buffers.get(e.bufferName))
@@ -184,11 +196,8 @@ rpc.addEventListener('BufferRemove', event => {
 
 rpc.addEventListener('BufferActivate', event => {
 	let old = buffers.get(bufferCurrent)
-	if (old !== undefined) {
-		old.newMessages = 0
-		old.newUnimportantMessages = 0
-		old.highlighted = false
-	}
+	if (old !== undefined)
+		resetBufferStats(old)
 
 	let e = event.detail, b = buffers.get(e.bufferName)
 	bufferCurrent = e.bufferName