### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Linux Mint 20 (Ulyana) - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 SUPER (nvidia; 515.105.01) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

Dragging and dropping a file to a new position inside its current folder, or onto the icon for its current folder - when that folder is the project root folder :res// - will be treated as though you were dropping a different file with the same name.

Expectation: for nothing to happen.

Also tried it in 4.0.3 and 4.1-dev3, where it behaves as expected.

https://github.com/godotengine/godot/assets/64640811/90de1120-dd92-41b8-b202-db77c343103a

### Steps to reproduce

1. New or existing project.
2. Click and drag a file in :res// in FileSystem dock.
3. Drop the file back into :res//.
4. Be prompted to overwrite or rename.

### Minimal reproduction project

N/A
button_file_list_display_mode->set_flat(true);
	path_hb->add_child(button_file_list_display_mode);
	files = memnew(FileSystemList);
	files->set_v_size_flags(SIZE_EXPAND_FILL);
	files->set_select_mode(ItemList::SELECT_MULTI);
	SET_DRAG_FORWARDING_GCD(files, FileSystemDock);
	files->connect("item_clicked", callable_mp(this, &FileSystemDock::_file_list_item_clicked));
	files->connect("gui_input", callable_mp(this, &FileSystemDock::_file_list_gui_input));
	files->connect("multi_selected", callable_mp(this, &FileSystemDock::_file_multi_selected));
	files->connect("empty_clicked", callable_mp(this, &FileSystemDock::_file_list_empty_clicked));
	files->connect("item_edited", callable_mp(this, &FileSystemDock::_rename_operation_confirm));
	files->set_custom_minimum_size(Size2(0, 15 * EDSCALE));
	files->set_allow_rmb_select(true);
	file_list_vb->add_child(files);
	scanning_vb = memnew(VBoxContainer);
	scanning_vb->hide();
	add_child(scanning_vb);
	Label *slabel = memnew(Label);
	slabel->set_text(TTR("Scanning Files,\nPlease Wait..."));
	slabel->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_CENTER);
	scanning_vb->add_child(slabel);
	scanning_progress = memnew(ProgressBar);
	scanning_vb->add_child(scanning_progress);
	deps_editor = memnew(DependencyEditor);
	add_child(deps_editor);
	owners_editor = memnew(DependencyEditorOwners());
	add_child(owners_editor);
	remove_dialog = memnew(DependencyRemoveDialog);
	remove_dialog->connect("resource_removed", callable_mp(this, &FileSystemDock::_resource_removed));
	remove_dialog->connect("file_removed", callable_mp(this, &FileSystemDock::_file_removed));