fixed deleting rows

data/key-mapper.glade

@@ -248,6 +248,7 @@
     <property name="width_request">450</property>
     <property name="can_focus">False</property>
     <property name="title" translatable="yes">Key Mapper</property>
+    <property name="default_height">280</property>
     <property name="icon_name">mouse</property>
     <signal name="delete-event" handler="on_close" swapped="no"/>
     <child>

keymapper/gtk/window.py

@@ -279,12 +279,7 @@ class Window:
         """
         key_list = self.get('key_list')
         # https://stackoverflow.com/a/30329591/4417769
-        key_list.remove(single_key_mapping.get_widget().get_parent())
-        # shrink the window down as much as possible, otherwise it
-        # will increase with each added mapping but won't go back when they
-        # are removed.
-        window = self.get('window')
-        window.resize(window.get_size()[0], 1)
+        key_list.remove(single_key_mapping.get_widget())
 
     def save_config(self):
         """Write changes to disk"""