[gimp] Allow full range to Hue-Saturation Lightness slider

[Michael Natterer <mitch src gnome org>]

commit 7880711fef2f536482f9cb68264b0fc542145716
Author: Elle Stone <ellestone ninedegreesbelow com>
Date:   Mon Jul 22 09:50:46 2019 -0400

    Allow full range to Hue-Saturation Lightness slider
    
    Issue #427: Hue-saturation dialog: lightness in 'Master'
    
    For whatever reason that made sense at the time, the current
    Hue-Saturation code divides the result of Lightness slider
    adjustments by 2, which means the user can't ever move the
    Lightness slider to produce a solid white or black image, and
    requires multiple iterations if the user wants to make the image
    very light or very dark.
    
    This patch just removes the division by 2, thus allowing the full
    range of Lightness changes without having to use multiple
    iterations.

 app/operations/gimpoperationhuesaturation.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app/operations/gimpoperationhuesaturation.c b/app/operations/gimpoperationhuesaturation.c
index cdfb7d7233..f4f1907feb 100644
--- a/app/operations/gimpoperationhuesaturation.c
+++ b/app/operations/gimpoperationhuesaturation.c
@@ -154,7 +154,7 @@ map_lightness (GimpHueSaturationConfig *config,
                GimpHueRange             range,
                gdouble                  value)
 {
-  gdouble v = (config->lightness[GIMP_HUE_RANGE_ALL] + config->lightness[range]) / 2.0;
+  gdouble v = (config->lightness[GIMP_HUE_RANGE_ALL] + config->lightness[range]);
 
   if (v < 0)
     return value * (v + 1.0);