[gimp] app: use "step" blending function in "FG to BG (Hardedge)" gradient

[Ell <ell src gnome org>]

commit 84066ca26ae635ee87f2db15294f0d0d89e15c9e
Author: Ell <ell_se yahoo com>
Date:   Tue Oct 2 21:23:34 2018 -0400

    app: use "step" blending function in "FG to BG (Hardedge)" gradient
    
    Use a single segment with a "step" blending function, added in the
    previous commit, instead of two separate segments, for the "FG to
    BG (Hardedge)" internal gradient.  This makes it simpler to change
    its endpoint colors by modifying the gradient, instead of changing
    the FG/BG colors.

 app/core/gimp-gradients.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)
---
diff --git a/app/core/gimp-gradients.c b/app/core/gimp-gradients.c
index 9602db25d2..2c4ec0fa1e 100644
--- a/app/core/gimp-gradients.c
+++ b/app/core/gimp-gradients.c
@@ -81,18 +81,9 @@ gimp_gradients_init (Gimp *gimp)
   gradient = gimp_gradients_add_gradient (gimp,
                                           _("FG to BG (Hardedge)"),
                                           FG_BG_HARDEDGE_KEY);
-  gradient->segments->left                   = 0.00;
-  gradient->segments->middle                 = 0.25;
-  gradient->segments->right                  = 0.50;
-  gradient->segments->left_color_type        = GIMP_GRADIENT_COLOR_FOREGROUND;
-  gradient->segments->right_color_type       = GIMP_GRADIENT_COLOR_FOREGROUND;
-  gradient->segments->next                   = gimp_gradient_segment_new ();
-  gradient->segments->next->prev             = gradient->segments;
-  gradient->segments->next->left             = 0.50;
-  gradient->segments->next->middle           = 0.75;
-  gradient->segments->next->right            = 1.00;
-  gradient->segments->next->left_color_type  = GIMP_GRADIENT_COLOR_BACKGROUND;
-  gradient->segments->next->right_color_type = GIMP_GRADIENT_COLOR_BACKGROUND;
+  gradient->segments->left_color_type  = GIMP_GRADIENT_COLOR_FOREGROUND;
+  gradient->segments->right_color_type = GIMP_GRADIENT_COLOR_BACKGROUND;
+  gradient->segments->type             = GIMP_GRADIENT_SEGMENT_STEP;
 
   /* FG to BG (HSV counter-clockwise) */
   gradient = gimp_gradients_add_gradient (gimp,