[gimp/gimp-2-8] Bug 701410 - Small artifacts appear when performing a selection

[Téo Mazars <teom src gnome org>]

commit f7cbd9de654cd4e94d0b83315482dab2c67b1b82
Author: Téo Mazars <teo mazars ensimag fr>
Date:   Fri Jun 21 20:09:18 2013 +0200

    Bug 701410 - Small artifacts appear when performing a selection
    
    Do not allow negative radius.
    (cherry picked from commit 7a0f8ad78ef26fa004359eb155385960baef14cf)

 app/display/gimpcanvasarc.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/app/display/gimpcanvasarc.c b/app/display/gimpcanvasarc.c
index 93433b4..ad71b2d 100644
--- a/app/display/gimpcanvasarc.c
+++ b/app/display/gimpcanvasarc.c
@@ -257,8 +257,8 @@ gimp_canvas_arc_transform (GimpCanvasItem   *item,
 
   if (! private->filled)
     {
-      *radius_x -= 0.5;
-      *radius_y -= 0.5;
+      *radius_x = MAX (*radius_x - 0.5, 0.0);
+      *radius_y = MAX (*radius_y - 0.5, 0.0);
     }
 }