Enabled imgui viewports

Nuake/src/Window.cpp

@@ -155,8 +155,20 @@ namespace Nuake
 
     void Window::EndDraw()
     {
+        ImGui::EndFrame();
         ImGui::Render();
+
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        if (ImGui::GetIO().ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        {
+            GLFWwindow* backup_current_context = glfwGetCurrentContext();
+            ImGui::UpdatePlatformWindows();
+            ImGui::RenderPlatformWindowsDefault();
+            glfwMakeContextCurrent(backup_current_context);
+        }
+
+
         glfwSwapBuffers(m_Window);
         glfwPollEvents();
     }
@@ -263,6 +275,7 @@ namespace Nuake
         io.Fonts->AddFontFromFileTTF("resources/Fonts/Poppins-Regular.ttf", 16.0);
 
         io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+        io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
         ImGui::StyleColorsDark();
 
         ImGuiStyle& s = ImGui::GetStyle();