Add a test for pasting a wrapped commit message into the summary

If you paste a commit message into the summary with the terminal's
paste command, the body keeps its hard line breaks. 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. Pasting with the
commit menu already removes these line breaks.

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

pkg/integration/tests/commit/paste_multi_line_commit_message_with_hard_line_breaks.go

@@ -0,0 +1,39 @@
+package commit
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var PasteMultiLineCommitMessageWithHardLineBreaks = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Paste a commit message whose body was wrapped at the auto-wrap width into the summary with the terminal's paste command, and check that the body reflows when editing it",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.CreateFileAndAdd("file", "file content")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Files().
+			Focus().
+			Press(keys.Files.CommitChanges)
+
+		t.ExpectPopup().CommitMessagePanel().
+			Paste("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.").
+			Content(Equals("subject"))
+
+		t.ExpectPopup().CommitDescriptionPanel().
+			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

@@ -188,6 +188,7 @@ var tests = []*components.IntegrationTest{
 	commit.PasteCommitMessageWithHardLineBreaks,
 	commit.PasteIntoCommitDescription,
 	commit.PasteMultiLineCommitMessage,
+	commit.PasteMultiLineCommitMessageWithHardLineBreaks,
 	commit.PreserveCommitMessage,
 	commit.PreserveCommitMessageWhitespace,
 	commit.ResetAuthor,