Make time-based room list sorting persistent (ref #11)

matrix/matrix.go

@@ -255,7 +255,7 @@ func (c *Container) HandlePushRules(evt *gomatrix.Event) {
 
 // HandleTag is the event handler for the m.tag account data event.
 func (c *Container) HandleTag(evt *gomatrix.Event) {
-	debug.Print("Received updated tags")
+	debug.Print("Received updated tags for", evt.RoomID)
 	dat, _ := json.MarshalIndent(&evt.Content, "", "  ")
 	debug.Print(string(dat))
 }

matrix/rooms/room.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"sort"
 	"sync"
+	"time"
 
 	"maunium.net/go/gomatrix"
 )
@@ -52,6 +53,9 @@ type Room struct {
 	// a notificationless message like bot notices.
 	HasNewMessages bool
 
+	Tags []string
+	LastReceivedMessage time.Time
+
 	// MXID -> Member cache calculated from membership events.
 	memberCache map[string]*Member
 	// The first non-SessionUserID member in the room. Calculated at