Make sure plugins get backbuffers too.

dcc/src/com/dmdirc/addons/dcc/ChatContainer.java

@@ -98,6 +98,7 @@ public class ChatContainer extends DCCFrameContainer implements DCCChatHandler {
         nickname = nick;
         otherNickname = targetNick;
         this.eventBus = eventBus;
+        initBackBuffer();
     }
 
     /**

dcc/src/com/dmdirc/addons/dcc/DCCFrameContainer.java

@@ -76,6 +76,7 @@ public abstract class DCCFrameContainer extends FrameContainer {
                 messageSinkManager,
                 eventBus,
                 components);
+        initBackBuffer();
     }
 
     @Override

dcc/src/com/dmdirc/addons/dcc/PlaceholderContainer.java

@@ -65,6 +65,7 @@ public class PlaceholderContainer extends FrameContainer {
                 Collections.singletonList("com.dmdirc.addons.dcc.ui.PlaceholderPanel"));
         this.plugin = plugin;
         this.parentWindow = parentWindow;
+        initBackBuffer();
     }
 
     @Override

dcc/src/com/dmdirc/addons/dcc/TransferContainer.java

@@ -106,6 +106,7 @@ public class TransferContainer extends FrameContainer implements
 
         otherNickname = targetNick;
         this.eventBus = eventBus;
+        initBackBuffer();
     }
 
     @Override

logging/src/com/dmdirc/addons/logging/HistoryWindow.java

@@ -57,6 +57,7 @@ public class HistoryWindow extends FrameContainer {
                 urlBuilder, eventBus,
                 Collections.singletonList(WindowComponent.TEXTAREA.getIdentifier()));
 
+        initBackBuffer();
         final int frameBufferSize = parent.getConfigManager().getOptionInt(
                 "ui", "frameBufferSize");
         try (final ReverseFileReader reader = new ReverseFileReader(logFile)) {

parserdebug/src/com/dmdirc/addons/parserdebug/DebugWindow.java

@@ -63,6 +63,7 @@ public class DebugWindow extends FrameContainer {
         this.listener = listener;
         this.parser = parser;
         this.connection = connection;
+        initBackBuffer();
     }
 
     @Override

redirect/src/com/dmdirc/addons/redirect/FakeWriteableFrameContainer.java

@@ -56,6 +56,7 @@ public class FakeWriteableFrameContainer extends FrameContainer {
                 target.getCommandParser(), target.getTabCompleter(), messageSinkManager, eventBus,
                 Collections.<String>emptyList());
         this.target = target;
+        initBackBuffer();
     }
 
     @Override