[gtk] snapshot: Only normalize rectangle if we have to

[Timm Bäder <baedert src gnome org>]

commit 21a7dfae964ee5186b54e1445671b4d0559fc483
Author: Timm Bäder <mail baedert org>
Date:   Tue Dec 31 08:54:42 2019 +0100

    snapshot: Only normalize rectangle if we have to
    
    We can even replace the comment this way.

 gtk/gtksnapshot.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtksnapshot.c b/gtk/gtksnapshot.c
index c87ba493f9..b1bee0fba9 100644
--- a/gtk/gtksnapshot.c
+++ b/gtk/gtksnapshot.c
@@ -587,8 +587,9 @@ gtk_graphene_rect_scale_affine (const graphene_rect_t *rect,
   res->origin.y = scale_y * rect->origin.y + dy;
   res->size.width = scale_x * rect->size.width;
   res->size.height = scale_y * rect->size.height;
-  /* necessary when scale_x or scale_y are < 0 */
-  graphene_rect_normalize (res);
+
+  if (scale_x < 0 || scale_y < 0)
+    graphene_rect_normalize (res);
 }
 
 static void