切换工作区时，SDL2窗口会升起（Xorg）

Question

我用SDL2创建了一个简单的OpenGL窗口。我在Linux上运行它，我的WM是xfwm4。

我的问题是，如果我更改工作区（使用ctrl + alt +箭头）而窗口没有聚焦，它会自行升起。这使窗口显示在新工作区上，或者（根据WM设置）立即切换回工作区。有办法防止这种情况吗？

这是一个演示此行为的测试用例：

#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>

int main(int argc, char *argv[])
{
    SDL_Init(SDL_INIT_VIDEO);
    SDL_Window *window = SDL_CreateWindow("test",  SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 200, 200, SDL_WINDOW_OPENGL);
    SDL_GLContext glcontext = SDL_GL_CreateContext(window);
    glEnable(GL_SCISSOR_TEST);

    while (1)
    {
        SDL_Event e;

        SDL_PollEvent(&e);
        if (e.type == SDL_QUIT || e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_ESCAPE)
                break;

        // a small opengl effect, please don't mind
        int bs = (rand() % 50) + 50; int bo = (200-bs)/2;
        float t = SDL_GetTicks()*0.001f; glScissor(0, cos(t*18.92623f)*bo+bo,200,bs);
        float g = sin(t)*0.5f+0.5f; glClearColor(2.0f*g,1.5f*g,0.8f*g,0.f); glClear(GL_COLOR_BUFFER_BIT);
        SDL_GL_SwapWindow(window);
    }

    SDL_GL_DeleteContext(glcontext);  

    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}