1 files changed, 44 insertions, 0 deletions
diff --git a/routers/repo/branch.go b/routers/repo/branch.go
index b0a1efc5b9..df6e0bf21f 100644
--- a/routers/repo/branch.go
+++ b/routers/repo/branch.go
@@ -16,6 +16,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/repofiles"
 	"code.gitea.io/gitea/modules/util"
+	"gopkg.in/src-d/go-git.v4/plumbing"
 )
 
 const (
@@ -33,6 +34,7 @@ type Branch struct {
 	CommitsAhead      int
 	CommitsBehind     int
 	LatestPullRequest *models.PullRequest
+	MergeMovedOn      bool
 }
 
 // Branches render repository branch page
@@ -185,6 +187,12 @@ func loadBranches(ctx *context.Context) []*Branch {
 		return nil
 	}
 
+	repoIDToRepo := map[int64]*models.Repository{}
+	repoIDToRepo[ctx.Repo.Repository.ID] = ctx.Repo.Repository
+
+	repoIDToGitRepo := map[int64]*git.Repository{}
+	repoIDToGitRepo[ctx.Repo.Repository.ID] = ctx.Repo.GitRepo
+
 	branches := make([]*Branch, len(rawBranches))
 	for i := range rawBranches {
 		commit, err := rawBranches[i].GetCommit()
@@ -213,11 +221,46 @@ func loadBranches(ctx *context.Context) []*Branch {
 			ctx.ServerError("GetLatestPullRequestByHeadInfo", err)
 			return nil
 		}
+		headCommit := commit.ID.String()
+
+		mergeMovedOn := false
 		if pr != nil {
+			pr.HeadRepo = ctx.Repo.Repository
 			if err := pr.LoadIssue(); err != nil {
 				ctx.ServerError("pr.LoadIssue", err)
 				return nil
 			}
+			if repo, ok := repoIDToRepo[pr.BaseRepoID]; ok {
+				pr.BaseRepo = repo
+			} else if err := pr.LoadBaseRepo(); err != nil {
+				ctx.ServerError("pr.LoadBaseRepo", err)
+				return nil
+			} else {
+				repoIDToRepo[pr.BaseRepoID] = pr.BaseRepo
+			}
+
+			if pr.HasMerged {
+				baseGitRepo, ok := repoIDToGitRepo[pr.BaseRepoID]
+				if !ok {
+					baseGitRepo, err = git.OpenRepository(pr.BaseRepo.RepoPath())
+					if err != nil {
+						ctx.ServerError("OpenRepository", err)
+						return nil
+					}
+					defer baseGitRepo.Close()
+					repoIDToGitRepo[pr.BaseRepoID] = baseGitRepo
+				}
+				pullCommit, err := baseGitRepo.GetRefCommitID(pr.GetGitRefName())
+				if err != nil && err != plumbing.ErrReferenceNotFound {
+					ctx.ServerError("GetBranchCommitID", err)
+					return nil
+				}
+				if err == nil && headCommit != pullCommit {
+					// the head has moved on from the merge - we shouldn't delete
+					mergeMovedOn = true
+				}
+			}
+
 		}
 
 		isIncluded := divergence.Ahead == 0 && ctx.Repo.Repository.DefaultBranch != branchName
@@ -230,6 +273,7 @@ func loadBranches(ctx *context.Context) []*Branch {
 			CommitsAhead:      divergence.Ahead,
 			CommitsBehind:     divergence.Behind,
 			LatestPullRequest: pr,
+			MergeMovedOn:      mergeMovedOn,
 		}
 	}