### 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
current_path = history[history_pos];
	_set_current_path_line_edit_text(current_path);
	if (tree->is_visible()) {
		_update_tree(get_uncollapsed_paths());
		tree->grab_focus();
		tree->ensure_cursor_is_visible();
	}
	if (file_list_vb->is_visible()) {
		_update_file_list(false);
	}
	button_hist_prev->set_disabled(history_pos == 0);
	button_hist_next->set_disabled(history_pos == history.size() - 1);
}
void FileSystemDock::_push_to_history() {
	if (history[history_pos] != current_path) {
		history.resize(history_pos + 1);
		history.push_back(current_path);
		history_pos++;
		if (history.size() > history_max_size) {
			history.remove_at(0);
			history_pos = history_max_size - 1;
		}
	}
	button_hist_prev->set_disabled(history_pos == 0);
	button_hist_next->set_disabled(history_pos == history.size() - 1);
}
void FileSystemDock::_get_all_items_in_dir(EditorFileSystemDirectory *p_efsd, Vector<String> &r_files, Vector<String> &r_folders) const {