Dont trigger notification twice on issue assignee change (#9582)

routers/repo/issue.go

@@ -23,7 +23,6 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/markup/markdown"
-	"code.gitea.io/gitea/modules/notification"
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/util"
@@ -1177,13 +1176,11 @@ func UpdateIssueAssignee(ctx *context.Context) {
 				return
 			}
 
-			removed, comment, err := issue_service.ToggleAssignee(issue, ctx.User, assigneeID)
+			_, _, err = issue_service.ToggleAssignee(issue, ctx.User, assigneeID)
 			if err != nil {
 				ctx.ServerError("ToggleAssignee", err)
 				return
 			}
-
-			notification.NotifyIssueChangeAssignee(ctx.User, issue, assignee, removed, comment)
 		}
 	}
 	ctx.JSON(200, map[string]interface{}{