Disconnect with an error message when receiving errors in early frames

This way it will only attempt to reconnect silently once, but if that
fails it won't loop forever, and instead it will show a hopefully useful
error message. Looking forward for new kinds of bug reports that aren't
"nothing works and i have no idea what's going on". Sorry for that.

libyahoo-plusplus.c

@@ -215,6 +215,7 @@ typedef struct {
 	GHashTable *media_urls;      // MediaId -> URL
 
 	GSList *http_conns; /**< PurpleHttpConnection to be cancelled on logout */
+	gint frames_since_reconnect;
 } YahooAccount;
 
 typedef void (*YahooProxyCallbackFunc)(YahooAccount *ya, JsonNode *node, gpointer user_data);
@@ -1210,7 +1211,15 @@ yahoo_process_frame(YahooAccount *ya, const gchar *frame)
 
 				ya->seq = 0;
 				//ya->ack = 0;
-				yahoo_start_socket(ya);
+
+				if (ya->frames_since_reconnect < 2) {
+					char *error = g_strdup_printf("Server error: \"%s\". If this keeps happening, report a bug. Try to include the debug window messages before the error happens.",
+						json_object_get_string_member(message, "reason"));
+					purple_connection_error(ya->pc, PURPLE_CONNECTION_ERROR_OTHER_ERROR, error);
+					g_free(error);
+				} else {
+					yahoo_start_socket(ya);
+				}
 
 				g_object_unref(parser);
 				return FALSE;
@@ -1233,6 +1242,7 @@ yahoo_process_frame(YahooAccount *ya, const gchar *frame)
 			}
 		}
 	}
+	ya->frames_since_reconnect += 1;
 
 	g_object_unref(parser);
 	return TRUE;
@@ -1477,11 +1487,14 @@ yahoo_socket_got_data(gpointer userdata, PurpleSslConnection *conn, PurpleInputC
 	}
 
 	if ((done_some_reads == FALSE && read_len <= 0 && errno != EAGAIN && errno != EINTR)) {
-		//purple_connection_error(ya->pc, PURPLE_CONNECTION_ERROR_NETWORK_ERROR, "Lost connection to server");
-
 		purple_debug_error("yahoo", "got errno %d, read_len %d from websocket thread\n", errno, read_len);
-		// Try reconnect
-		yahoo_start_socket(ya);
+
+		if (ya->frames_since_reconnect < 2) {
+			purple_connection_error(ya->pc, PURPLE_CONNECTION_ERROR_NETWORK_ERROR, "Lost connection to server");
+		} else {
+			// Try reconnect
+			yahoo_start_socket(ya);
+		}
 	}
 }
 
@@ -1547,7 +1560,8 @@ yahoo_start_socket(YahooAccount *ya)
 	g_free(ya->frame); ya->frame = NULL;
 	ya->packet_code = 0;
 	ya->frame_len = 0;
-
+	ya->frames_since_reconnect = 0;
+
 	ya->websocket = purple_ssl_connect(ya->account, "prod.iris.yahoo.com", 443, yahoo_socket_connected, yahoo_socket_failed, ya);
 }