Add 1px divider between message list and message view in split view

res/layout/split_message_list.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/container"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
@@ -10,12 +11,20 @@
         android:id="@+id/message_list_container"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
-        android:layout_weight="2" />
+        android:layout_weight="5" />
+
+    <View
+        android:id="@+id/message_list_divider"
+        android:layout_width="1px"
+        android:layout_height="fill_parent"
+        android:background="#ffcccccc"
+        android:visibility="gone"
+        tools:ignore="PxUsage" />
 
     <FrameLayout
         android:id="@+id/message_view_container"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
-        android:layout_weight="1" />
+        android:layout_weight="3" />
 
 </LinearLayout>

src/com/fsck/k9/activity/MessageList.java

@@ -235,6 +235,7 @@ public class MessageList extends K9FragmentActivity implements MessageListFragme
                 break;
             }
             case SPLIT_VIEW: {
+                findViewById(R.id.message_list_divider).setVisibility(View.VISIBLE);
                 if (mMessageViewFragment == null) {
                     showMessageViewPlaceHolder();
                 }