exit fullscreen with escape

Fltk/FlGui.cpp

@@ -465,6 +465,11 @@ int FlGui::testGlobalShortcuts(int event)
           Fl::test_shortcut(FL_SHIFT + FL_Escape) ||
           Fl::test_shortcut(FL_CTRL + FL_Escape) ||
           Fl::test_shortcut(FL_ALT + FL_Escape)) {
+    if(fullscreen->shown()){
+      window_cb(0, (void*)"fullscreen");
+      status = 1;
+    }
+    else{
       bool lasso = false;
       for(unsigned int i = 0; i < graph.size(); i++)
         for(unsigned int j = 0; j < graph[i]->gl.size(); j++)
@@ -480,6 +485,7 @@ int FlGui::testGlobalShortcuts(int event)
         status = 1;
       }
     }
+  }
   else if(Fl::test_shortcut(FL_SHIFT + 'a')) {
     window_cb(0, (void*)"front");
     status = 1;