SDL apps die when more than one are launched

[Saviq]

It's a regression within this commit range:

210d4c4...ecc4899

Steps to reproduce:

• run a Mir server
• run mir-kiosk-scummvm
• run mir-kiosk-neverputt

Notice that scummvm segfaults.

[AlanGriffiths]

Note that a starting a second instance of scummvm crashes the first

[AlanGriffiths]

OK, so when any second application appears, we are sending an output.enter(). SDL2 crashes (similar to earlier problem).

WAYLAND_DEBUG=client mir-kiosk-neverputt 2>&1 | grep wl_output
[1698092.122] wl_registry@2.global(27, "wl_output", 4)
[1698092.126]  -> wl_registry@2.bind(27, "wl_output", 2, new id [unknown]@15)
[1698092.427] wl_output@15.geometry(0, 0, 340, 220, 0, "Fake manufacturer", "Fake model", 0)
[1698092.436] wl_output@15.mode(0, 2560, 1600, 165000)
[1698092.442] wl_output@15.mode(3, 2560, 1600, 60000)
[1698092.446] wl_output@15.mode(0, 1920, 1200, 165000)
[1698092.451] wl_output@15.mode(0, 1920, 1080, 165000)
[1698092.456] wl_output@15.mode(0, 1600, 1200, 165000)
[1698092.460] wl_output@15.mode(0, 1680, 1050, 165000)
[1698092.464] wl_output@15.mode(0, 1280, 1024, 165000)
[1698092.469] wl_output@15.mode(0, 1440, 900, 165000)
[1698092.474] wl_output@15.mode(0, 1280, 800, 165000)
[1698092.479] wl_output@15.mode(0, 1280, 720, 165000)
[1698092.484] wl_output@15.mode(0, 1024, 768, 165000)
[1698092.487] wl_output@15.mode(0, 800, 600, 165000)
[1698092.491] wl_output@15.mode(0, 640, 480, 165000)
[1698092.494] wl_output@15.scale(1)
[1698092.496] wl_output@15.done()
[1698125.023] wl_registry@20.global(27, "wl_output", 4)
[1698144.866] wl_registry@21.global(27, "wl_output", 4)
[1698858.634] wl_surface@24.enter(wl_output@15)
[1717678.068] wl_output@15.geometry(0, 0, 340, 220, 0, "Fake manufacturer", "Fake model", 0)
[1717678.078] wl_output@15.mode(0, 2560, 1600, 165000)
Segmentation fault (core dumped)

[AlanGriffiths]

I don't see why we are sending another "enter" (we can likely address that), but I think SDL will crash when crossing screens anyway.