[PATCH 0/8] MR4533: winex11: Detach / attach vulkan window surfaces as needed.

[Rémi Bernon (＠rbernon)]

This is some preparatory work for vulkan child window and other features which currently live in Proton. I think this could be upstream already, and it will make rebasing patches on top of it simpler. To get vulkan child window upstream we'd probably still need to rework it a bit and maybe try to move the wait and blit to `vkQueuePresent` somehow.

The idea here is also that although Vulkan spec does not allow multiple active swapchains for the same window, Windows tends to allow it especially with D3D, and we also need to support the case where multiple APIs are use to draw onto the same window surface (as we implement D3D on top of GL/Vk for instance).