Add a test for a lock error partway through a pull with rebase

This has the same problem as an interactive rebase. If pull.rebase is
set and a lock stops the rebase partway through, the git command runner
runs "git pull" again. This fails with "You are not currently on a
branch" because HEAD is detached during the rebase, and the rebase is
left stopped halfway.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pkg/integration/tests/sync/lock_error_partway_through_pull_with_rebase.go

@@ -0,0 +1,80 @@
+package sync
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+	"github.com/jesseduffield/lazygit/pkg/integration/tests/shared"
+)
+
+var LockErrorPartwayThroughPullWithRebase = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Pull with a rebase strategy while another git process takes index.lock partway through the rebase",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.CreateFileAndAdd("file", "content1")
+		shell.Commit("one")
+		shell.UpdateFileAndAdd("file", "content2")
+		shell.Commit("two")
+		shell.CreateFileAndAdd("file3", "content3")
+		shell.Commit("three")
+
+		shell.CloneIntoRemote("origin")
+
+		shell.SetBranchUpstream("master", "origin/master")
+
+		shell.HardReset("HEAD^^")
+		shell.CreateFileAndAdd("file4", "content4")
+		shell.Commit("four")
+		shell.CreateFileAndAdd("file5", "content5")
+		shell.Commit("five")
+
+		shell.SetConfig("pull.rebase", "true")
+
+		// The rebase makes a commit when it picks "four"; the lock then stops
+		// it when it tries to pick "five".
+		shared.HoldIndexLockAfterNextCommit(shell)
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Lines(
+				Contains("five"),
+				Contains("four"),
+				Contains("one"),
+			)
+
+		t.Views().Status().Content(Equals("↓2↑2 repo → master"))
+
+		t.Views().Files().
+			IsFocused().
+			Press(keys.Universal.Pull)
+
+		/* EXPECTED:
+		t.Views().Status().Content(Equals("↑2 repo → master"))
+
+		t.Views().Commits().
+			Lines(
+				Contains("five"),
+				Contains("four"),
+				Contains("three"),
+				Contains("two"),
+				Contains("one"),
+			)
+		ACTUAL: */
+		t.ExpectPopup().Alert().
+			Title(Equals("Error")).
+			Content(Contains("You are not currently on a branch.")).
+			Confirm()
+
+		t.Views().Commits().
+			Lines(
+				Contains("─── Pending rebase todos"),
+				Contains("pick").Contains("five"),
+				Contains("─── Commits"),
+				Contains("four"),
+				Contains("three"),
+				Contains("two"),
+				Contains("one"),
+			)
+	},
+})

pkg/integration/tests/test_list.go

@@ -644,6 +644,7 @@ var tests = []*components.IntegrationTest{
 	sync.ForcePushMultipleUpstream,
 	sync.ForcePushRemoteBranchNotStoredLocally,
 	sync.ForcePushTriangular,
+	sync.LockErrorPartwayThroughPullWithRebase,
 	sync.Pull,
 	sync.PullAndSetUpstream,
 	sync.PullMerge,