Is it neccesary to always reset entity handles while loading dxf file?

[piaoger]

While checking a dxf file, I found all handles in QCAD are different from this crate. It seems that all handles of block entities are renewed. I wonder if we can keep the handles while loading a file.

    pub(crate) fn add_block_no_handle_set(&mut self, mut block: Block) -> &Block {
        self.ensure_layer_is_present_for_block(&block);
        self.ensure_line_type_is_present_for_block(&block);
        self.ensure_block_record_is_present_for_block(&mut block);
        self.ensure_block_entity_handles_are_set(&mut block);
        self.__blocks.push(block);
        self.__blocks.last().unwrap()
    }

    fn ensure_block_entity_handles_are_set(&mut self, block: &mut Block) {
        for ent in &mut block.entities {
            ent.common.handle = self.next_handle();
        }
    }