Running 2 X sessions, 2 WM, WM1 stops running spotify after I switch to WM2. Occasionally I running two Window Managers on my laptop for testing. One for my laptop and the other for a Raspberry Pi. When I switch to the second WM, my spotify stops playing. If I return to WM1, spotify start playing again, right where it stopped. This is a sign that all WM1 processes stop.
We do block GLX clients on VT switch (which is arguably a bug), but not all clients.
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