This patch makes two small changes to gdk/gdkdraw.c and gdk/gdk.h:
(1) It adds a gdk_draw_lines function, similar to gdk_draw_points and
gdk_draw_segments. I guess this got left out when gdkdraw.c was
originally written.
(2) If you try to draw an unfilled polygon using gtk_draw_polygon, and if
the first and last points are not equal, the current implementation
of gtk_draw_polygon will:
a) Connect up the points you passed in with XDrawLines.
b) Connect up the first and last points with XDrawLine.
That is fine until you try to draw a polygon using thick lines and
want to have your lines join up nicely... the joins on the last side
of the polygon is all screwed up.
This patch adds a tiny bit of code to detect this case, allocate
a new list of points w/ one more entry, copy everything into it,
and then set the new extra point equal to the first point before
calling XDrawLines.
