[gnome-control-center] background: Make sure the size of the light/dark previews is the same

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 5df1519d7d8bb16ae554dc550ec7b0ba736fd71a
Author: Sebastian Keller <skeller gnome org>
Date:   Thu May 5 10:13:34 2022 +0200

    background: Make sure the size of the light/dark previews is the same
    
    Without homogeneous columns the difference in the size of the light/dark
    labels could cause one preview to be larger.
    
    Fixes: https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1810

 panels/background/cc-background-panel.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/panels/background/cc-background-panel.ui b/panels/background/cc-background-panel.ui
index 71621a17b..7efbb64a9 100644
--- a/panels/background/cc-background-panel.ui
+++ b/panels/background/cc-background-panel.ui
@@ -18,6 +18,7 @@
                     <property name="tightening_threshold">300</property>
                     <child>
                       <object class="GtkGrid">
+                        <property name="column-homogeneous">True</property>
                         <property name="column-spacing">24</property>
                         <property name="row-spacing">12</property>
                         <property name="margin-start">12</property>