Spring cleaning: Apply clang-tidy to src/widget.

Using LLVM 3.8.0:

$ clang-tidy --fix --checks="*,-llvm-header-guard,-readability-implicit-bool-cast,-readability-else-after-return,-google-readability-todo" $(git ls src/widget | xargs) -- (flags to compile)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/widget/wsingletoncontainer.h b/src/widget/wsingletoncontainer.h
index 661c51fdf2..621f068188 100644
--- a/src/widget/wsingletoncontainer.h
+++ b/src/widget/wsingletoncontainer.h
@@ -56,12 +56,12 @@ class WSingletonContainer : public WWidgetGroup {
   public:
     // Prepares the container and remembers the widget, but does not add the
     // widget to the container.
-    WSingletonContainer(QWidget* pParent=NULL);
+    explicit WSingletonContainer(QWidget* pParent=nullptr);
 
     virtual void setup(QDomNode node, const SkinContext& context);
 
   public slots:
-    virtual void showEvent(QShowEvent* event);
+    void showEvent(QShowEvent* event) override;
 
   private:
     QPointer<QWidget> m_pWidget;