SDL_SetCursorGrab() is buggy on Windows

SDL Development
1

I have filed a bug report at
https://bugzilla.libsdl.org/show_bug.cgi?id=2260 but I am cross-posting
here in case someone has ever encountered this before.

Steps to reproduce:

  1. Grab the cursor with SDL_SetCursorGrab()
  2. Alt-tab away from the window
  3. Click on the titlebar of the window

This will cause the window to disappear underneath the taskbar!

This appears to be a general issue with ClipCursor() on windows, i.e. I am
getting the same behavior if I call ClipCursor() directly. Can anyone think
of a good workaround? I’ve tried ungrabbing the cursor on alt-tab (focus
lost) but this did not appear to help…

The following code reproduces the issue on Windows 7 SP1 and Windows 8.1.

#include “SDL.h”
#include “SDL_main.h”

int main(int argc, char *argv[])
{
SDL_Init(SDL_INIT_EVERYTHING);

auto wnd = SDL_CreateWindow(
    "Test",
    SDL_WINDOWPOS_CENTERED,
    SDL_WINDOWPOS_CENTERED,
    800,
    600,
    0);

SDL_SetWindowGrab(wnd, SDL_TRUE);

bool running = true;
while (running)
{
    SDL_Event e;
    if (SDL_PollEvent(&e))
    {
        switch (e.type)
        {
        case SDL_KEYDOWN:
        case SDL_WINDOWEVENT_CLOSE:
        case SDL_QUIT:
            running = false;
            break;
        }
    }
}

SDL_Quit();

return 0;

}