fixes #9 by recerating the opengl context after QMainWindow->show was

called

Core/Core.cc

@@ -98,6 +98,18 @@
 
 //== IMPLEMENTATION ==========================================================
 
+namespace {
+    void recreateContext()
+    {
+        QOpenGLContext* ctx = QOpenGLContext::currentContext();
+        QSurfaceFormat format = QSurfaceFormat::defaultFormat();
+        ctx->setFormat(format);
+        ctx->create();
+        QOffscreenSurface* surface = new QOffscreenSurface();
+        ctx->makeCurrent(surface);
+    }
+}
+
 /** \brief Constuctor for the Core Widget ( This is stage 1 , call init for stage 2)
  *
  * Initialization is working the following way:\n
@@ -653,6 +665,7 @@ Core::init() {
       coreWidget_->splitter_->restoreState (windowStates.value("Core/LogSplitter").toByteArray ());
 
       coreWidget_->show();
+      recreateContext();
 
       applyOptions();
 
@@ -671,6 +684,8 @@ Core::init() {
     } else {
 
       coreWidget_->show();
+      recreateContext();
+
       applyOptions();
 
     }