Merge branch 'fixSnapshot' into 'master'

Fix snapshot

Closes #2

See merge request !33

OpenFlipper.cc

@@ -571,14 +571,14 @@ int main(int argc, char **argv)
         }
       }
      }
-    
-    // After setting all Options from command line, build the real gui
-    w->init();
 
     #ifndef __APPLE__
     initGlew();
     #endif
- 
+
+    // After setting all Options from command line, build the real gui
+    w->init();
+
     const QStringList positionalArguments = parser.positionalArguments();
 
     for ( auto file: positionalArguments ) {

widgets/glWidget/QtBaseViewer.cc

@@ -226,7 +226,18 @@ glViewer::~glViewer()
 
 
 void glViewer::makeCurrent() {
+#if (QT_VERSION >= QT_VERSION_CHECK(5,4,4))
+  const GLuint prevFbo = ACG::GLState::getFramebufferDraw();
+#endif
+
+  // calling makeCurrent binds the default FBO when QOpenGLWidget is used
   glWidget_->makeCurrent();
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5,4,4))
+  //restore the previously bound FBO, if it was not 0 as Qt Documentation says we shall not bind 0
+  if(prevFbo != 0)
+    ACG::GLState::bindFramebuffer(GL_FRAMEBUFFER, prevFbo);
+#endif
 }