Add test showing problem with the display of renamed files

Renaming a file inside the same directory shows it with its full path in the
tree view, which isn't what we want. We'll fix this in the next commit.

Also adding a few other test cases for moving files; they show that the display
of moved files in tree view isn't ideal. For example, moving file1 from top
level into dir shows it as "R file1 → file1", which isn't distinguishable from
renaming file1 inside dir. I suppose what we would like to have here is
"R ../file1 → file1" or something, but I'll leave that for the future; here I
only want to fix the regression that was introduced with the root item PR.

pkg/integration/tests/file/renamed_files.go

@@ -0,0 +1,36 @@
+package file
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var RenamedFiles = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Regression test for the display of renamed files in the file tree",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(config *config.AppConfig) {
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.CreateDir("dir")
+		shell.CreateDir("dir/nested")
+		shell.CreateFileAndAdd("file1", "file1 content\n")
+		shell.CreateFileAndAdd("dir/file2", "file2 content\n")
+		shell.CreateFileAndAdd("dir/nested/file3", "file3 content\n")
+		shell.Commit("initial commit")
+		shell.RunCommand([]string{"git", "mv", "file1", "dir/file1"})
+		shell.RunCommand([]string{"git", "mv", "dir/file2", "dir/file2-renamed"})
+		shell.RunCommand([]string{"git", "mv", "dir/nested/file3", "file3"})
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Files().
+			IsFocused().
+			Lines(
+				Equals("▼ /"),
+				Equals("  ▼ dir"),
+				Equals("    R  file1 → file1"),
+				Equals("    R  dir/file2 → file2-renamed"), // don't want the 'dir/' prefix here
+				Equals("  R  dir/nested/file3 → file3"),
+			)
+	},
+})

pkg/integration/tests/test_list.go

@@ -195,6 +195,7 @@ var tests = []*components.IntegrationTest{
 	file.Gitignore,
 	file.RememberCommitMessageAfterFail,
 	file.RenameSimilarityThresholdChange,
+	file.RenamedFiles,
 	file.StageChildrenRangeSelect,
 	file.StageDeletedRangeSelect,
 	file.StageRangeSelect,