modify terminator separater size setting in gui to start from 1

terminatorlib/config.py

@@ -84,7 +84,7 @@ DEFAULTS = {
         'global_config':   {
             'dbus'                  : True,
             'focus'                 : 'click',
-            'handle_size'           : -1,
+            'handle_size'           : 1,
             'geometry_hinting'      : False,
             'window_state'          : 'normal',
             'borderless'            : False,

terminatorlib/preferences.glade

@@ -307,9 +307,9 @@
     </data>
   </object>
   <object class="GtkAdjustment" id="adjustment1">
-    <property name="lower">-1</property>
+    <property name="lower">1</property>
     <property name="upper">20</property>
-    <property name="value">-1</property>
+    <property name="value">1</property>
     <property name="step-increment">1</property>
     <property name="page-increment">2</property>
   </object>

terminatorlib/prefseditor.py

@@ -1270,6 +1270,8 @@ class PrefsEditor:
         value = int(value)          # Cast to int.
         if value > 20:
             value = 20
+        if value < 1:
+            value = 1
         self.config['handle_size'] = value
         self.config.save()
         guiget = self.builder.get_object