(struct face): Add comment for how to handle a negative value in
box_line_width.
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@ -1241,7 +1241,11 @@ struct face
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unsigned int pixmap_w, pixmap_h;
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/* Non-zero means characters in this face have a box that thickness
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around them. */
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around them. If it is negative, the absolute value indicates the
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thickness, and the horizontal lines of box (top and bottom) are
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drawn inside of characters glyph area. The vartical lines of box
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(left and right) are drawn as the same way as the case that this
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value is positive. */
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int box_line_width;
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/* Type of box drawn. A value of FACE_NO_BOX means no box is drawn
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