[gegl] motion-blur-zoom: limit value range to -10.0 to 10.0

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 2eb48cafb5492e08a7a8b38dab6f833cb2f4aace
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Jul 7 15:36:50 2019 +0200

    motion-blur-zoom: limit value range to -10.0 to 10.0
    
    There are existing tutorials that expect the user to enter absolute pixel
    values rather than relative values which this operation expects. Limiting
    to -10.0 to 10.0 encompasses all coordinats within image as well as enough
    outside on each side to make it unlikely intentional parameters. The ui
    range is already limited to 0.0-1.0
    
    Fixes issue #174

 operations/common-gpl3+/motion-blur-zoom.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/operations/common-gpl3+/motion-blur-zoom.c b/operations/common-gpl3+/motion-blur-zoom.c
index 8e4a6c9ec..ca2cced5a 100644
--- a/operations/common-gpl3+/motion-blur-zoom.c
+++ b/operations/common-gpl3+/motion-blur-zoom.c
@@ -38,11 +38,13 @@
 #ifdef GEGL_PROPERTIES
 
 property_double (center_x, _("Center X"), 0.5)
+    value_range (-10.0, 10.0)
     ui_range    (0.0, 1.0)
     ui_meta     ("unit", "relative-coordinate")
     ui_meta     ("axis", "x")
 
 property_double (center_y, _("Center Y"), 0.5)
+    value_range (-10.0, 10.0)
     ui_range    (0.0, 1.0)
     ui_meta     ("unit", "relative-coordinate")
     ui_meta     ("axis", "y")