Bring popped out window to focus when switching keyboard input.

Change-Id: I5e6e7883fb67a65ebfebf6cc1bbac039e5a3ec75
Fixes-Issue: CLIENT-388
Reviewed-on: http://gerrit.dmdirc.com/2623
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/MainFrame.java

@@ -623,6 +623,8 @@ public final class MainFrame extends JFrame implements WindowListener,
                 framePanel.setVisible(true);
 
                 if (activeFrame != null) {
+                    activeFrame.requestFocus();
+                    activeFrame.requestFocusInWindow();
                     activeFrame.activateFrame();
                 }