EditorManager: Do not be a widget.

There is no reason for the editor manager itself to be a widget. This
makes even less sense in the presence of multiple windows.

Change-Id: I384f8945fdd5632d64643e473e6637e05abbce7e
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/debugger/debuggerplugin.cpp

@@ -3292,7 +3292,6 @@ void DebuggerPluginPrivate::extensionsInitialized()
     modeContextObject->setContext(Core::Context(CC::C_EDITORMANAGER));
     modeContextObject->setWidget(widget);
     Core::ICore::addContextObject(modeContextObject);
-    widget->setFocusProxy(EditorManager::instance());
     debugMode->setWidget(widget);
 
     m_plugin->addAutoReleasedObject(debugMode);