Only send chat history when joining.

When we moved the chat history to the client goroutine back in 0.6,
we started sending the history whenever the group configuration changed.
Only send it when first joining the group.  Thanks to Rémi Nollet.

rtpconn/webclient.go

@@ -1168,8 +1168,9 @@ func handleAction(c *webClient, a interface{}) error {
 	case joinedAction:
 		var status *group.Status
 		var data map[string]interface{}
+		var g *group.Group
 		if a.group != "" {
-			g := group.Get(a.group)
+			g = group.Get(a.group)
 			if g != nil {
 				s := g.Status(true, "")
 				status = &s
@@ -1190,18 +1191,25 @@ func handleAction(c *webClient, a interface{}) error {
 		if err != nil {
 			return err
 		}
-		h := c.group.GetChatHistory()
-		for _, m := range h {
-			err := c.write(clientMessage{
-				Type:     "chathistory",
-				Source:   m.Id,
-				Username: m.User,
-				Time:     m.Time,
-				Value:    m.Value,
-				Kind:     m.Kind,
-			})
-			if err != nil {
-				return err
+		if a.kind == "join" {
+			if g == nil {
+				log.Println("g is null when joining" +
+					"this shouldn't happen")
+				return nil
+			}
+			h := g.GetChatHistory()
+			for _, m := range h {
+				err := c.write(clientMessage{
+					Type:     "chathistory",
+					Source:   m.Id,
+					Username: m.User,
+					Time:     m.Time,
+					Value:    m.Value,
+					Kind:     m.Kind,
+				})
+				if err != nil {
+					return err
+				}
 			}
 		}
 	case permissionsChangedAction: