Core: Introduce a IOptionsPage::setLayout(const LayoutItem)

Helps to move the lambda setup off the user code.

Change-Id: I0de43f53fc9018913340e81b5c1e8e69df067bd6
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/coreplugin/dialogs/ioptionspage.cpp

@@ -9,6 +9,7 @@
 #include <coreplugin/icore.h>
 
 #include <utils/aspects.h>
+#include <utils/layoutbuilder.h>
 #include <utils/qtcassert.h>
 #include <utils/stringutils.h>
 
@@ -204,6 +205,14 @@ void IOptionsPage::setLayouter(const std::function<void(QWidget *w)> &layouter)
     m_layouter = layouter;
 }
 
+void IOptionsPage::setLayout(const Layouting::LayoutItem &layout)
+{
+    using namespace Layouting;
+    m_layouter = [layout](QWidget *widget) {
+        Column { Row { Column { layout, st }, st } }.attachTo(widget);
+    };
+}
+
 /*!
     \fn void Core::IOptionsPage::setId(Utils::Id id)