[gnome-control-center/wip/exalm/bg] background: Fix thumbnail size on hidpi

[Alexander Mikhaylenko <alexm src gnome org>]

commit c5864c4c4ccbafb20b1e17a46d2b1694e2a47246
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Feb 26 12:46:34 2021 +0500

    background: Fix thumbnail size on hidpi
    
    Use GIcon GtkImage API instead lf GdkPixbuf. The latter treats pixbufs as
    always being in 1x scale and upscales them to compensate, while in our case
    they are pre-scaled.
    
    Fixes https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/787

 panels/background/cc-background-chooser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/background/cc-background-chooser.c b/panels/background/cc-background-chooser.c
index de201b8da..6c8f56136 100644
--- a/panels/background/cc-background-chooser.c
+++ b/panels/background/cc-background-chooser.c
@@ -105,7 +105,7 @@ create_widget_func (gpointer model_item,
                                              bg_source_get_thumbnail_width (source),
                                              bg_source_get_thumbnail_height (source),
                                              bg_source_get_scale_factor (source));
-  image = gtk_image_new_from_pixbuf (pixbuf);
+  image = gtk_image_new_from_gicon (G_ICON (pixbuf), GTK_ICON_SIZE_DIALOG);
   gtk_widget_show (image);
 
   icon = gtk_image_new_from_icon_name("slideshow-emblem", GTK_ICON_SIZE_BUTTON);