Regression test for renaming the last commit of a stacked branch

I almost broke this during the development of this branch, so add a test to
guard against that. The point here is that the stack remains intact, i.e. the
renamed commit is the head of the lower branch, and thus shows the "*".

pkg/integration/tests/interactive_rebase/reword_last_commit_of_stacked_branch.go

@@ -0,0 +1,55 @@
+package interactive_rebase
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var RewordLastCommitOfStackedBranch = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Rewords the last commit of a branch in the middle of a stack",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	GitVersion:   AtLeast("2.38.0"),
+	SetupConfig: func(config *config.AppConfig) {
+		config.GetUserConfig().Git.MainBranches = []string{"master"}
+		config.GetAppState().GitLogShowGraph = "never"
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.
+			CreateNCommits(1).
+			NewBranch("branch1").
+			CreateNCommitsStartingAt(2, 2).
+			NewBranch("branch2").
+			CreateNCommitsStartingAt(2, 4)
+
+		shell.SetConfig("rebase.updateRefs", "true")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Lines(
+				Contains("CI commit 05").IsSelected(),
+				Contains("CI commit 04"),
+				Contains("CI * commit 03"),
+				Contains("CI commit 02"),
+				Contains("CI commit 01"),
+			).
+			NavigateToLine(Contains("commit 03")).
+			Press(keys.Commits.RenameCommit).
+			Tap(func() {
+				t.ExpectPopup().CommitMessagePanel().
+					Title(Equals("Reword commit")).
+					InitialText(Equals("commit 03")).
+					Clear().
+					Type("renamed 03").
+					Confirm()
+			}).
+			Lines(
+				Contains("CI commit 05"),
+				Contains("CI commit 04"),
+				Contains("CI * renamed 03"),
+				Contains("CI commit 02"),
+				Contains("CI commit 01"),
+			)
+	},
+})

pkg/integration/tests/test_list.go

@@ -274,6 +274,7 @@ var tests = []*components.IntegrationTest{
 	interactive_rebase.RewordCommitWithEditorAndFail,
 	interactive_rebase.RewordFirstCommit,
 	interactive_rebase.RewordLastCommit,
+	interactive_rebase.RewordLastCommitOfStackedBranch,
 	interactive_rebase.RewordYouAreHereCommit,
 	interactive_rebase.RewordYouAreHereCommitWithEditor,
 	interactive_rebase.ShowExecTodos,