Bug in 1.12.4 and 1.12.6

When stroking two or more curves and the path is clipped
the result is wrong in some cases.

Looks like the second curve is interpreted as a "line_to"

Increased linewith will decrease the error.

See test prog and png.

Test prog.:
-----------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <cairo.h>

int
main(void)
{
     int x;

     cairo_surface_t *s=cairo_image_surface_create(CAIRO_FORMAT_RGB24, 
200, 200);
     cairo_t *cr=cairo_create(s);

     cairo_set_source_rgb(cr, 1, 1, 1);
     cairo_paint(cr);

     cairo_set_source_rgb(cr, 0, 0, 0);
     cairo_set_line_width(cr, 1.0);

     cairo_move_to(cr, 92.0,    163.0);
     cairo_curve_to(cr, 133.0,    163.0,
                     166.0,    132.0,
                     166.0,    96.0);
     cairo_curve_to(cr, 166.0,   58.0,
                            133.0,   27.0,
                      92.0,   27.0);
/*
     cairo_curve_to(cr, 52.0,   27.0,
                            19.0,   58.0,
                     19.0,    96.0);
     cairo_curve_to(cr,  19.0,    132.0,
                             52.0,    163.0,
                       92.0,    163.0);
     cairo_close_path(cr);
*/
     cairo_stroke(cr); /* result is OK */

     cairo_set_source_rgb(cr, 1, 0, 0);

        for(x=0; x < 190; x++){
         cairo_rectangle(cr, 0,x, 200,1);
         cairo_clip(cr);

         cairo_move_to(cr, 92.0,    163.0);
         cairo_curve_to(cr, 133.0,    163.0,
                     166.0,    132.0,
                     166.0,    96.0);
         cairo_curve_to(cr, 166.0,   58.0,
                            133.0,   27.0,
                      92.0,   27.0);
/*
         cairo_curve_to(cr, 52.0,   27.0,
                            19.0,   58.0,
                     19.0,    96.0);
         cairo_curve_to(cr,  19.0,    132.0,
                             52.0,    163.0,
                       92.0,    163.0);
         cairo_close_path(cr);
*/
         cairo_stroke(cr); /* result might be wrong */
         cairo_reset_clip(cr);
        }

      cairo_surface_write_to_png(s, "test.png");

     cairo_surface_destroy(s);
     cairo_destroy(cr);
     return 0;
}

---------------------------

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