filter editor: better spacing

data/ui/filter-editor.ui

 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.19.0 -->
+<!-- Generated with glade 3.22.1 -->
 <interface>
   <requires lib="gtk+" version="3.0"/>
   <object class="GtkBox" id="filter_editor">
@@ -59,12 +59,10 @@
             <child>
               <object class="GtkCheckButton" id="match_checkbutton">
                 <property name="label" translatable="yes">_Match:</property>
-                <property name="use_action_appearance">False</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">False</property>
                 <property name="use_underline">True</property>
-                <property name="xalign">0</property>
                 <property name="draw_indicator">True</property>
               </object>
               <packing>
@@ -95,12 +93,25 @@
           </packing>
         </child>
         <child>
-          <object class="GtkBox" id="box1">
+          <object class="GtkBox">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
-            <property name="margin_left">20</property>
+            <property name="margin_left">25</property>
             <property name="orientation">vertical</property>
             <property name="spacing">6</property>
+            <child>
+              <object class="GtkLabel">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="label" translatable="yes">Rules:</property>
+                <property name="xalign">0</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
             <child>
               <object class="GtkBox" id="tests_box">
                 <property name="visible">True</property>
@@ -114,7 +125,7 @@
               <packing>
                 <property name="expand">False</property>
                 <property name="fill">True</property>
-                <property name="position">0</property>
+                <property name="position">1</property>
               </packing>
             </child>
           </object>
@@ -151,12 +162,10 @@
                 <child>
                   <object class="GtkCheckButton" id="limit_to_checkbutton">
                     <property name="label" translatable="yes">_Limit to</property>
-                    <property name="use_action_appearance">False</property>
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">False</property>
                     <property name="use_underline">True</property>
-                    <property name="xalign">0.5</property>
                     <property name="draw_indicator">True</property>
                   </object>
                   <packing>
@@ -165,6 +174,23 @@
                     <property name="position">0</property>
                   </packing>
                 </child>
+                <child>
+                  <placeholder/>
+                </child>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkBox">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="margin_left">25</property>
+                <property name="orientation">vertical</property>
+                <property name="spacing">15</property>
                 <child>
                   <object class="GtkBox" id="limit_options_hbox">
                     <property name="visible">True</property>
@@ -200,23 +226,9 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">1</property>
+                    <property name="position">0</property>
                   </packing>
                 </child>
-              </object>
-              <packing>
-                <property name="expand">False</property>
-                <property name="fill">True</property>
-                <property name="position">0</property>
-              </packing>
-            </child>
-            <child>
-              <object class="GtkBox" id="box2">
-                <property name="visible">True</property>
-                <property name="can_focus">False</property>
-                <property name="margin_left">20</property>
-                <property name="orientation">vertical</property>
-                <property name="spacing">6</property>
                 <child>
                   <object class="GtkBox" id="selection_box">
                     <property name="visible">True</property>
@@ -266,7 +278,7 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">False</property>
-                    <property name="position">0</property>
+                    <property name="position">1</property>
                   </packing>
                 </child>
               </object>