在编辑 UTF-8BOM 编码的文件时，会在前面重复添加乱码

[RONGMIN_LIANG]

Issue Description

�#include “sander.h”
频繁遇到文件开头添加一个乱码，导致程序编译失败。

Steps to Reproduce

Expected Behavior

Actual Behavior

Screenshots / Screen Recordings

Operating System

ubuntu20.04

Current Qoder Version (Menu → About Qoder → Copy)

0.2.14