How to make c-indent-line-region respect indent-tabs-mode when it's already aligned?

[Hong Xu <hong@topbug.net>]

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Hi,

Currently it seems that c-indent-line-region ignores the value of
indent-tabs-mode. For example, I have the following in a buffer

    int main()
    {
    <Tab>int x;
    }

and my indent-tabs-mode is nil. If 8 spaces is what expected, calling
c-indent-line-or-region would do nothing. However, if it's not aligned

    int main()
    {
    <Tab>   int x;
    }

calling c-indent-line-or-region would correct the tab with appropriate
number of spaces.

Is there a different line indentation function which respects
indent-tabs-mode even the line is already aligned?

Thanks,
Hong

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