Mouse cursor disappears in RHEL guest when using "-device virtio-vga-gl -display gtk,gl=on" option
Description of problem:
Mouse cursor disappears in RHEL guest when using -device virtio-vga-gl -display gtk,gl=on
Steps to reproduce:
1. Build qemu using the following `./configure` options:
```
--prefix=$HOME/.bin --target-list=x86_64-softmmu --enable-kvm --enable-vnc --enable-gtk --enable-vte --enable-xkbcommon --enable-sdl --enable-spice --enable-spice-protocol --enable-virglrenderer --enable-opengl --enable-guest-agent --enable-avx2 --enable-avx512f --enable-hax --enable-system --enable-linux-user --enable-libssh --enable-linux-aio --enable-linux-io-uring --enable-modules --enable-gio --enable-fuse --enable-fuse-lseek
```
2. Install Red Hat Enterprise Linux 8.5 in qemu
3. Run qemu using the above command line. The mouse cursor disappears once it moves into the VM.
Additional information: