[gimp] app: call cairo_surface_flush before drawing directly

[Massimo Valentini <mvalentini src gnome org>]

commit 13716023837e5cdaa97ae979828d5938eb153ddb
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Thu May 26 19:54:01 2011 +0200

    app: call cairo_surface_flush before drawing directly

 app/display/gimpcanvastransformpreview.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/app/display/gimpcanvastransformpreview.c b/app/display/gimpcanvastransformpreview.c
index cb97aa5..21c3e6d 100644
--- a/app/display/gimpcanvastransformpreview.c
+++ b/app/display/gimpcanvastransformpreview.c
@@ -934,6 +934,7 @@ gimp_canvas_transform_preview_draw_tri_row (GimpDrawable    *texture,
   if (! dx)
     return;
 
+  cairo_surface_flush (area);
   pptr = (cairo_image_surface_get_data (area)
           + (y - area_offy) * cairo_image_surface_get_stride (area)
           + (x1 - area_offx) * 4);
@@ -1171,6 +1172,7 @@ gimp_canvas_transform_preview_draw_tri_row_mask (GimpDrawable    *texture,
   mu = u + mask_offx;
   mv = v + mask_offy;
 
+  cairo_surface_flush (area);
   pptr = (cairo_image_surface_get_data (area)
           + (y - area_offy) * cairo_image_surface_get_stride (area)
           + (x1 - area_offx) * 4);