Add a test for pasting a commit message that has hard line breaks

If you copy a commit's message with `y` in the commits panel and paste
it into the commit message panel with the commit menu, the body keeps
the hard line breaks that git committed. This happens even where
auto-wrapping would break the line at the same place. If you then edit
a paragraph of the body, it doesn't reflow.

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

pkg/integration/tests/commit/paste_commit_message_with_hard_line_breaks.go

@@ -0,0 +1,57 @@
+package commit
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var PasteCommitMessageWithHardLineBreaks = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Paste a commit message whose body was wrapped at the auto-wrap width, and check that the body reflows when editing it",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(config *config.AppConfig) {
+		config.GetUserConfig().OS.CopyToClipboardCmd = "printf '%s' {{text}} > ../clipboard"
+		config.GetUserConfig().OS.ReadFromClipboardCmd = "cat ../clipboard"
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("subject\n\n" +
+			"The body of this commit was wrapped at the auto-wrap width when it was\n" +
+			"committed, so it contains a hard line break.")
+		shell.CreateFileAndAdd("file", "file content")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Press(keys.Commits.CopyCommitAttributeToClipboard)
+
+		t.ExpectPopup().Menu().Title(Equals("Copy to clipboard")).
+			Select(Contains("Commit message (subject and body)")).Confirm()
+
+		t.ExpectToast(Equals("Commit message copied to clipboard"))
+
+		t.Views().Files().
+			Focus().
+			Press(keys.Files.CommitChanges)
+
+		t.ExpectPopup().CommitMessagePanel().
+			OpenCommitMenu()
+
+		t.ExpectPopup().Menu().Title(Equals("Commit Menu")).
+			Select(Contains("Paste commit message from clipboard")).
+			Confirm()
+
+		t.ExpectPopup().CommitMessagePanel().
+			Content(Equals("subject")).
+			SwitchToDescription().
+			GoToBeginning().
+			Type("Now ").
+			Content(Equals(
+				/* EXPECTED:
+				"Now The body of this commit was wrapped at the auto-wrap width when it \n" +
+					"was committed, so it contains a hard line break."))
+				ACTUAL: */
+				"Now The body of this commit was wrapped at the auto-wrap width when it \n" +
+					"was\n" +
+					"committed, so it contains a hard line break."))
+	},
+})

pkg/integration/tests/test_list.go

@@ -185,6 +185,7 @@ var tests = []*components.IntegrationTest{
 	commit.NewBranch,
 	commit.PasteCommitMessage,
 	commit.PasteCommitMessageOverExisting,
+	commit.PasteCommitMessageWithHardLineBreaks,
 	commit.PreserveCommitMessage,
 	commit.PreserveCommitMessageWhitespace,
 	commit.ResetAuthor,