[gegl] dropshadow: use double for the "grow-radius" property

[Ell <ell src gnome org>]

commit 208f6b1304a8c2acce8fa418fb5c5f87392cc5c8
Author: Ell <ell_se yahoo com>
Date:   Sun Mar 22 13:35:48 2020 +0200

    dropshadow: use double for the "grow-radius" property
    
    ... instead of int.  The gegl:median-blur "radius" property, which
    "grow-radius" is redirected to, is an int, but this was a mistake,
    and it's not easy to fix rectroactively, because it's part of the
    ABI.  Let's at least future-proof gegl:dropshadow.

 operations/common/dropshadow.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/operations/common/dropshadow.c b/operations/common/dropshadow.c
index d27a13e1c..830f7aa87 100644
--- a/operations/common/dropshadow.c
+++ b/operations/common/dropshadow.c
@@ -55,9 +55,10 @@ property_enum   (grow_shape, _("Grow shape"),
                  GEGL_DROPSHADOW_GROW_SHAPE_CIRCLE)
   description   (_("The shape to expand or contract the shadow in"))
 
-property_int    (grow_radius, _("Grow radius"), 0.0)
-  value_range   (-100, 100)
-  ui_range      (-50, 50)
+property_double (grow_radius, _("Grow radius"), 0.0)
+  value_range   (-100.0, 100.0)
+  ui_range      (-50.0, 50.0)
+  ui_digits     (0)
   ui_steps      (1, 5)
   ui_gamma      (1.5)
   ui_meta       ("unit", "pixel-distance")