[gimp/gimp-2-8] Bug 656522 - Scaled Image Rounds Up To Nearest Pixel

[Michael Natterer <mitch src gnome org>]

commit 333b05be02a39ca3b15ab1318c049fd29fc9d3ef
Author: Téo Mazars <teo mazars ensimag fr>
Date:   Sun Feb 24 16:48:33 2013 +0100

    Bug 656522 - Scaled Image Rounds Up To Nearest Pixel
    
    Prevent gimp_coordinates_callback () to be called recursively
    when x and y are chained.
    
    One call puts all values in a consistent state, a recusive call can
    cause side effects (calculations with rounded values)
    (cherry picked from commit 24a2113170fbc3c81590d873be40d6544ab95377)

 libgimpwidgets/gimpwidgets.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/libgimpwidgets/gimpwidgets.c b/libgimpwidgets/gimpwidgets.c
index b0bbbb7..b2e91b1 100644
--- a/libgimpwidgets/gimpwidgets.c
+++ b/libgimpwidgets/gimpwidgets.c
@@ -588,6 +588,10 @@ gimp_coordinates_callback (GtkWidget           *widget,
         {
           if ((data->orig_x != 0) && (data->orig_y != 0))
             {
+              g_signal_handlers_block_by_func (widget,
+                                               gimp_coordinates_callback,
+                                               data);
+
               if (ROUND (new_x) != ROUND (data->last_x))
                 {
                   data->last_x = new_x;
@@ -608,6 +612,10 @@ gimp_coordinates_callback (GtkWidget           *widget,
                   data->last_x
                     = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (widget), 0);
                 }
+
+              g_signal_handlers_unblock_by_func (widget,
+                                                 gimp_coordinates_callback,
+                                                 data);
             }
         }
       else