test floating some panels

src/app.cpp

@@ -594,6 +594,8 @@ void App::update(float dt)
             }
             //auto box = n->m_clip;
             //glm::ivec4 c = glm::vec4((int)box.x - 1, (int)(height / zoom - box.y - box.w) - 1, (int)box.z + 2, (int)box.w + 2) * zoom;
+            if (box.z <= 0.f || box.w <= 0.f)
+                return false;
             glm::ivec4 c = glm::vec4((int)box.x, (int)(height / zoom - box.y - box.w), (int)box.z, (int)box.w) * zoom;
             glScissor(c.x + off_x, c.y + off_y, c.z, c.w);
             n->draw();