Fix display of renamed files

This broke with #4346 (Add root node in file tree).

pkg/gui/presentation/files.go

@@ -308,7 +308,7 @@ func fileNameAtDepth(node *filetree.Node[models.File], depth int) string {
 	name := join(splitName[depth:])
 
 	if node.File != nil && node.File.IsRename() {
-		splitPrevName := split(node.File.PreviousPath)
+		splitPrevName := split("./" + node.File.PreviousPath)
 
 		prevName := node.File.PreviousPath
 		// if the file has just been renamed inside the same directory, we can shave off

pkg/integration/tests/file/renamed_files.go

@@ -29,7 +29,7 @@ var RenamedFiles = NewIntegrationTest(NewIntegrationTestArgs{
 				Equals("▼ /"),
 				Equals("  ▼ dir"),
 				Equals("    R  file1 → file1"),
-				Equals("    R  dir/file2 → file2-renamed"), // don't want the 'dir/' prefix here
+				Equals("    R  file2 → file2-renamed"),
 				Equals("  R  dir/nested/file3 → file3"),
 			)
 	},