separator for joystick config

data/key-mapper.glade

@@ -274,7 +274,6 @@
     <property name="width-request">700</property>
     <property name="can-focus">False</property>
     <property name="title" translatable="yes">Key Mapper</property>
-    <property name="default-height">400</property>
     <property name="icon-name">mouse</property>
     <signal name="delete-event" handler="on_close" swapped="no"/>
     <child>
@@ -562,10 +561,29 @@
                         <property name="position">3</property>
                       </packing>
                     </child>
+                  </object>
+                  <packing>
+                    <property name="expand">True</property>
+                    <property name="fill">True</property>
+                    <property name="position">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkSeparator" id="gamepad_separator">
+                    <property name="visible">True</property>
+                    <property name="can-focus">False</property>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">1</property>
+                  </packing>
+                </child>
                 <child>
                   <object class="GtkBox" id="gamepad_config">
                     <property name="visible">True</property>
                     <property name="can-focus">False</property>
+                    <property name="border-width">15</property>
                     <property name="orientation">vertical</property>
                     <property name="spacing">10</property>
                     <child>
@@ -698,13 +716,6 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                        <property name="position">6</property>
-                      </packing>
-                    </child>
-                  </object>
-                  <packing>
-                    <property name="expand">True</property>
-                    <property name="fill">True</property>
                     <property name="position">2</property>
                   </packing>
                 </child>

keymapper/gtk/window.py

@@ -158,8 +158,10 @@ class Window:
         """Set slider and dropdown values when a gamepad is selected."""
         devices = get_devices()
         if devices[self.selected_device]['gamepad']:
+            self.get('gamepad_separator').show()
             self.get('gamepad_config').show()
         else:
+            self.get('gamepad_separator').hide()
             self.get('gamepad_config').hide()
             return