[cairo] cairo_current_font() changes

[Owen Taylor]

Since this came up on IRC, there are two changes to cairo_current_font()
in current CVS.

 1. It doesn't reference the returned font. (It was decided that 
    this should be a general property of getters, recently.)

 2. What it returns is quite different. To quote briefly from the
    docs.

      A cairo_font_t is a font scaled to a
      particular size and device resolution. A font can be set on a
      cairo_t by using cairo_set_font, assuming that the
      current transformation and target surface of the 
      cairo_t match that for which the
      cairo_font_t was created. The effect of
      using a mismatched cairo_font_t will be
      incorrect font metrics.

Regards,
						Owen

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