Restore propagation of ErrDependenciesLeft (go-gitea#18325)

Unfortunately go-gitea#17643 prevented all propagation of ErrDependenciesLeft meaning
that dependency errors that prevent closing of issues get swallowed.

This PR restores propagation of the error but instead swallows the error in the
places where it needs to be swallowed.

Fix go-gitea#18223

Signed-off-by: Andrew Thornton <art27@cantab.net>

services/issue/status.go

@@ -8,17 +8,17 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/db"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/notification"
 )
 
 // ChangeStatus changes issue status to open or closed.
 func ChangeStatus(issue *models.Issue, doer *user_model.User, closed bool) error {
 	comment, err := issue.ChangeStatus(doer, closed)
 	if err != nil {
-		// Don't return an error when dependencies are open as this would let the push fail
-		if models.IsErrDependenciesLeft(err) {
-			if closed {
-				return models.FinishIssueStopwatchIfPossible(db.DefaultContext, doer, issue)
+		if models.IsErrDependenciesLeft(err) && closed {
+			if err := models.FinishIssueStopwatchIfPossible(db.DefaultContext, doer, issue); err != nil {
+				log.Error("Unable to stop stopwatch for issue[%d]#%d: %v", issue.ID, issue.Index, err)
 			}
 		}
 		return err

services/pull/merge.go

@@ -105,7 +105,10 @@ func Merge(pr *models.PullRequest, doer *user_model.User, baseGitRepo *git.Repos
 		close := ref.RefAction == references.XRefActionCloses
 		if close != ref.Issue.IsClosed {
 			if err = issue_service.ChangeStatus(ref.Issue, doer, close); err != nil {
-				return err
+				// Allow ErrDependenciesLeft
+				if !models.IsErrDependenciesLeft(err) {
+					return err
+				}
 			}
 		}
 	}

services/pull/pull.go

@@ -514,7 +514,7 @@ func CloseBranchPulls(doer *user_model.User, repoID int64, branch string) error
 
 	var errs errlist
 	for _, pr := range prs {
-		if err = issue_service.ChangeStatus(pr.Issue, doer, true); err != nil && !models.IsErrPullWasClosed(err) {
+		if err = issue_service.ChangeStatus(pr.Issue, doer, true); err != nil && !models.IsErrPullWasClosed(err) && !models.IsErrDependenciesLeft(err) {
 			errs = append(errs, err)
 		}
 	}