Improve Stopwatch behavior (#18930)

- Don't send empty stopwatch over and over again, only send once.
- Stop interval to update stopwatch's timer when there is no more stopwatch.

modules/eventsource/manager_run.go

@@ -9,7 +9,9 @@ import (
 	"time"
 
 	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/convert"
 	"code.gitea.io/gitea/modules/graceful"
+	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/setting"
@@ -80,6 +82,31 @@ loop:
 				})
 			}
 			then = now
+
+			if setting.Service.EnableTimetracking {
+				usersStopwatches, err := models.GetUIDsAndStopwatch()
+				if err != nil {
+					log.Error("Unable to get GetUIDsAndStopwatch: %v", err)
+					return
+				}
+
+				for _, userStopwatches := range usersStopwatches {
+					apiSWs, err := convert.ToStopWatches(userStopwatches.StopWatches)
+					if err != nil {
+						log.Error("Unable to APIFormat stopwatches: %v", err)
+						continue
+					}
+					dataBs, err := json.Marshal(apiSWs)
+					if err != nil {
+						log.Error("Unable to marshal stopwatches: %v", err)
+						continue
+					}
+					m.SendMessage(userStopwatches.UserID, &Event{
+						Name: "stopwatches",
+						Data: string(dataBs),
+					})
+				}
+			}
 		}
 	}
 	m.UnregisterAll()