2f825f3a86
ATM sending modifiers to clients prevents direct scanout for DRI3 clients via Xwayland. Xwayland using the dma-buf feedback v4 Wayland protocol will solve that, but that might take a while yet to appear in the wild. Once that happens, this can be reverted. Direct scanout still works for native Wayland clients as well. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2637>