makeCurrent when destroying ManagedDisplayWidgets

Fixes #1555

app/widget/manageddisplay/manageddisplay.cpp

@@ -70,7 +70,7 @@ ManagedDisplayWidget::ManagedDisplayWidget(QWidget *parent) :
 
 ManagedDisplayWidget::~ManagedDisplayWidget()
 {
-  OnDestroy();
+  MANAGEDDISPLAYWIDGET_DEFAULT_DESTRUCTOR_INNER;
 
   if (RenderManager::instance()->backend() == RenderManager::kOpenGL) {
     disconnect(static_cast<ManagedDisplayWidgetOpenGL*>(inner_widget_),

app/widget/manageddisplay/manageddisplay.h

@@ -82,6 +82,11 @@ private slots:
 
 };
 
+#define MANAGEDDISPLAYWIDGET_DEFAULT_DESTRUCTOR_INNER \
+  makeCurrent();OnDestroy();doneCurrent()
+#define MANAGEDDISPLAYWIDGET_DEFAULT_DESTRUCTOR(x) \
+  virtual ~x() override{MANAGEDDISPLAYWIDGET_DEFAULT_DESTRUCTOR_INNER;}
+
 class ManagedDisplayWidget : public QWidget
 {
   Q_OBJECT