Debugger: Attach Context(CC::C_EDITORMANAGER) in main widget constructor

... when it is created, but don't force widget creation to be
able to attach the context.

Change-Id: I62a7610241e68d658f2b31fb98666d94fe6061d7
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/debugger/debuggerplugin.cpp

@@ -484,6 +484,8 @@ public:
 
         mainWindow->addSubPerspectiveSwitcher(EngineManager::engineChooser());
         mainWindow->addSubPerspectiveSwitcher(EngineManager::dapEngineChooser());
+
+        IContext::attach(this, Context(CC::C_EDITORMANAGER));
     }
 };
 
@@ -1168,8 +1170,6 @@ DebuggerPluginPrivate::DebuggerPluginPrivate(const QStringList &arguments)
     // Debug mode setup
     m_mode = new DebugMode;
 
-    IContext::attach(m_mode->widget(), Context(CC::C_EDITORMANAGER));
-
     //
     //  Connections
     //