Update overlay geometries when central widget changes size

We were only updating the overlays when the main window changed
size, but it can happen that only the central widget changes size,
for example when you remove or add a toolbar

Fixes #227

src/MainWindowBase.cpp

@@ -87,6 +87,10 @@ MainWindowBase::MainWindowBase(const QString &uniqueName, KDDockWidgets::MainWin
 
     connect(d->m_layoutWidget, &LayoutWidget::visibleWidgetCountChanged, this,
             &MainWindowBase::frameCountChanged);
+
+    connect(this, &MainWindowBase::centralWidgetResized, this, [this] {
+        d->updateOverlayedDockWidgetGeometries();
+    });
 }
 
 MainWindowBase::~MainWindowBase()