[PATCH 1/5] gdiplus: Reuse point when calling GdipAddPathBezier on open figure.

[Esme Povirk (they/them)]

+GpStatus extend_current_figure(GpPath *path, INT count, REAL x1, REAL
y1, INT *old_count)

I don't like this interface. It's hard for me to think about what
"count" and "old_count" really mean. One of them is an index into
Points, and one is a number of points.

I'd probably do something like: extend_current_figure(GpPath *path,
REAL start_x, REAL start_y, INT extra_points, INT *start_index)

I don't really like extra_points as a name, but passing in the number
of points that need to be added other than the start point makes more
sense to me when we don't know if the start point will be added or
reused.

I think no matter how we do it, we'll need a comment explaining what
this function does.