buf->setLoadedDirty(false);// Since the buffer will be reloaded from the disk, and it will be clean (not dirty), we can set _isLoadedDirty false safetly.
// Set _isLoadedDirty false before calling "_pscratchTilla->execute(SCI_CLEARALL);" in loadFileData() to avoid setDirty in SCN_SAVEPOINTREACHED / SCN_SAVEPOINTLEFT