Fix negative issue count (#3207)

models/repo.go

@@ -1832,14 +1832,14 @@ func CheckRepoStats() {
 
 	// ***** START: Repository.NumClosedIssues *****
 	desc := "repository count 'num_closed_issues'"
-	results, err := x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_closed_issues!=(SELECT COUNT(*) FROM `issue` WHERE repo_id=repo.id AND is_closed=?)", true)
+	results, err := x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_closed_issues!=(SELECT COUNT(*) FROM `issue` WHERE repo_id=repo.id AND is_closed=? AND is_pull=?)", true, false)
 	if err != nil {
 		log.Error(4, "Select %s: %v", desc, err)
 	} else {
 		for _, result := range results {
 			id := com.StrTo(result["id"]).MustInt64()
 			log.Trace("Updating %s: %d", desc, id)
-			_, err = x.Exec("UPDATE `repository` SET num_closed_issues=(SELECT COUNT(*) FROM `issue` WHERE repo_id=? AND is_closed=?) WHERE id=?", id, true, id)
+			_, err = x.Exec("UPDATE `repository` SET num_closed_issues=(SELECT COUNT(*) FROM `issue` WHERE repo_id=? AND is_closed=? AND is_pull=?) WHERE id=?", id, true, false, id)
 			if err != nil {
 				log.Error(4, "Update %s[%d]: %v", desc, id, err)
 			}