修改自定义defun以与Magit不冲突

我在.emacs中使用以下智能选项卡defun来完成一个单词或只是做一个标准选项卡:

(global-set-key [(tab)] 'smart-tab)
(defun smart-tab ()
  "This smart tab is minibuffer compliant: it acts as usual in
    the minibuffer. Else, if mark is active, indents region. Else if
    point is at the end of a symbol, expands it. Else indents the
    current line."
  (interactive)
  (if (minibufferp)
      (unless (minibuffer-complete)
        (dabbrev-expand nil))
    (if mark-active
        (indent-region (region-beginning)
                       (region-end))
      (if (looking-at "\\_>")
          (dabbrev-expand nil)
        (indent-for-tab-command)))))

但是,当我magit-status用于git Git集成时,我之前可以选择一个已修改的文件,点击标签,并立即在该文件上看到差异以查看已修改的内容.但是,每当我现在尝试选项卡时,我的迷你缓冲区中都会出现以下错误.

indent-relative: Buffer is read-only: #