Fix the "Add to .git/info/exclude" command in submodules or worktrees

pkg/commands/git_commands/working_tree.go

@@ -3,6 +3,7 @@ package git_commands
 import (
 	"fmt"
 	"os"
+	"path"
 
 	"github.com/go-errors/errors"
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
@@ -232,7 +233,8 @@ func (self *WorkingTreeCommands) Ignore(filename string) error {
 
 // Exclude adds a file to the .git/info/exclude for the repo
 func (self *WorkingTreeCommands) Exclude(filename string) error {
-	return self.os.AppendLineToFile(".git/info/exclude", filename)
+	excludeFile := path.Join(self.repoPaths.repoGitDirPath, "info", "exclude")
+	return self.os.AppendLineToFile(excludeFile, filename)
 }
 
 // WorktreeFileDiff returns the diff of a file

pkg/integration/tests/worktree/exclude_file_in_worktree.go

@@ -34,13 +34,8 @@ var ExcludeFileInWorktree = NewIntegrationTest(NewIntegrationTestArgs{
 			Tap(func() {
 				t.ExpectPopup().Menu().Title(Equals("Ignore or exclude file")).Select(Contains("Add to .git/info/exclude")).Confirm()
 			}).
-			/* EXPECTED:
 			IsEmpty()
 
-			t.FileSystem().FileContent("../repo/.git/info/exclude", Contains("toExclude"))
-			ACTUAL: */
-			Tap(func() {
-				t.ExpectPopup().Alert().Title(Equals("Error")).Content(Contains("open .git/info/exclude: not a directory"))
-			})
+		t.FileSystem().FileContent("../repo/.git/info/exclude", Contains("toExclude"))
 	},
 })