I noticed after upgrading to 5.16.90 that automatic suspension of compositing doesn't appear to be working for me anymore. I was going back to some more freesync testing, and noticed it wasn't turning on in any game. This included native games (Talos, SS3, etc), Feral Ports, and Proton games. I know at least the native/Feral games used to send the flag to turn it off automatically, which I thought was actually done at the SDL level. I have the settings "Allow Applications to Block Compositing" ticked off in System Settings. I am not sure when this actually broke (or if it is supposed to still work).

Steps to reproduce:

1. Open Steam
2. Launch any game in full screen
3. Notice that compositing isn't disabled (and things like Freesync are blocked)

Reproducible:

Always for me.

Work around:

1) Press  "shift" + "alt" + "f12"
2) Compositor turns off, things like Freesync immediately start working.


Operating System: Arch Linux (kde-unstable enabled, testing disabled)
KDE Plasma Version: 5.16.90
KDE Frameworks Version: 5.62.0
Qt Version: 5.13.1
Kernel Version: 5.3.1-arch1-1-ARCH
OS Type: 64-bit
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 15.6 GiB of RAM
GPU: NVIDIA  GTX 1070
Driver: 435.21