Add the current device classname to the plugboard UI.

src/calibre/gui2/preferences/plugboard.py

@@ -39,6 +39,12 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
 
         ConfigWidgetBase.initialize(self)
 
+        if self.gui.device_manager.connected_device is not None:
+            self.device_label.setText(_('Device currently connected: ') +
+                    self.gui.device_manager.connected_device.__class__.__name__)
+        else:
+            self.device_label.setText(_('Device currently connected: None'))
+
         self.devices = ['']
         for device in device_plugins():
             n = device.__class__.__name__

src/calibre/gui2/preferences/plugboard.ui

@@ -40,7 +40,18 @@ One possible use for a plugboard is to alter the title to contain series informa
      </property>
     </widget>
    </item>
-   <item row="2" column="0">
+   <item row="2" column="0" colspan="2">
+    <widget class="QLabel" name="device_label">
+    </widget>
+   </item>
+   <item row="3" column="0" colspan="2">
+    <widget class="Line" name="line">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item row="4" column="0">
     <layout class="QGridLayout" name="gridLayout_2">
      <item row="0" column="1">
       <widget class="QLabel" name="label_6">
@@ -123,7 +134,7 @@ One possible use for a plugboard is to alter the title to contain series informa
      </item>
     </layout>
    </item>
-   <item row="2" column="1">
+   <item row="4" column="1">
     <layout class="QGridLayout" name="fields_layout">
      <item row="0" column="0">
       <widget class="QLabel" name="label_2">