### 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
import_dock_needs_update = true;
	call_deferred(SNAME("_update_import_dock"));
	
	if (!p_selected) {
		return;
	}
	
	TreeItem *selected = tree->get_selected();
	if (!selected) {
		return;
	}
	TreeItem *favorites_item = tree->get_root()->get_first_child();
	if (selected->get_parent() == favorites_item && !String(selected->get_metadata(0)).ends_with("/")) {
		
		current_path = "Favorites";
	} else {
		current_path = selected->get_metadata(0);
		
	}
	
	_set_current_path_line_edit_text(current_path);
	_push_to_history();
	
	if (!updating_tree && display_mode == DISPLAY_MODE_SPLIT) {
		_update_file_list(false);
	}
}
Vector<String> FileSystemDock::get_selected_paths() const {