Description of problem:
I installed SDL2 and tried some windowed SDL2 programs using "SDL_VIDEODRIVER=wayland", and found that window decoration was still missing.

After digging around, some head scratching, and looking through the SDL2 code, I found that it depends on an external libdecor.

I found libdecor in the Fedora repo, and installed it, and lo and behold, it worked.

So as I see it, there are two solutions. Either SDL2 should depend on libdecor, or every windowed SDL2 program should depend on libdecor.

To me, the former seems better than the latter.

Now, SDL2 is still defaulting to X11 on Wayland, so for the moment this will only effect a subset of users that set the SDL_VIDEODRIVER environment variable.

Version-Release number of selected component (if applicable):
$ rpm -qa|grep "SDL2\|libdecor"
SDL2_net-2.0.1-13.fc34.x86_64
SDL2_net-devel-2.0.1-13.fc34.x86_64
SDL2-2.0.16-1.fc34.x86_64
SDL2-static-2.0.16-1.fc34.x86_64
SDL2-devel-2.0.16-1.fc34.x86_64
SDL2-2.0.16-1.fc34.i686
libdecor-0.1.0-1.fc34.x86_64

How reproducible:
Every time, unless libdecor is installed

Steps to Reproduce:
1. Update to SDL 2.0.16, but don't install libdecor
2. run windowed SDL program with SDL_VIDEODRIVER=wayland
3.

Actual results:
No window decoration

Expected results:
Window decoration

Additional info: