Request DirInfo whenever the unread count may have changed

Actions such as read / unread or the addition of new messages do change
the read/unread/recent count. Hence we request an update from the workers.
Workers going over the network should probably cache the information and invalidate
it only if necessary

lib/msgstore.go

@@ -168,6 +168,7 @@ func merge(to *models.MessageInfo, from *models.MessageInfo) {
 func (store *MessageStore) Update(msg types.WorkerMessage) {
 	update := false
 	directoryChange := false
+	requestDirInfo := false
 	switch msg := msg.(type) {
 	case *types.DirectoryInfo:
 		store.DirInfo = *msg.Info
@@ -212,6 +213,7 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 			}
 		}
 		update = true
+		requestDirInfo = true
 	case *types.FullMessage:
 		if _, ok := store.pendingBodies[msg.Content.Uid]; ok {
 			delete(store.pendingBodies, msg.Content.Uid)
@@ -245,6 +247,7 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 		}
 		store.uids = uids
 		update = true
+		requestDirInfo = true
 	}
 
 	if update {
@@ -254,6 +257,12 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 	if directoryChange && store.triggerDirectoryChange != nil {
 		store.triggerDirectoryChange()
 	}
+
+	if requestDirInfo {
+		store.worker.PostAction(&types.DirectoryInfoUpdateRequest{
+			Name: store.DirInfo.Name,
+		}, nil)
+	}
 }
 
 func (store *MessageStore) OnUpdate(fn func(store *MessageStore)) {

worker/types/messages.go

@@ -149,6 +149,13 @@ type DirectoryInfo struct {
 	Info *models.DirectoryInfo
 }
 
+// Sent whenever we assume that a directory content changed
+// workers are requested to update the DirectoryInfo to display the unread count
+type DirectoryInfoUpdateRequest struct {
+	Message
+	Name string
+}
+
 type DirectoryContents struct {
 	Message
 	Uids []uint32