updateMode/setMode behaviour differs from 11.5

[Endaris]

The window position updates in some odd and not quite predictable ways in love 12 using SDL3.
The expected outcome for the following repro is that the window stays centered at all times and modifies its position.
I am able to verify this with the 11.5 release as well as the output of a 12.0 CI run before the SDL3 adoption.

On my machine, using the CI build from 2 days ago, the first updateMode does not change the window position.
The second updateMode changes the window position but the new position is not centered on the display.

Repro main.lua:

local resize1 = false
local resize2 = false

function love.load()
  love.window.setMode(800, 600, { resizable = true, centered = true})
end

function love.update()
  if not resize1 and love.timer.getTime() > 4 then
    love.window.updateMode(640, 480)
    resize1 = true
  elseif not resize2 and love.timer.getTime() > 7 then
    love.window.updateMode(300, 480)
    resize2 = true
  end
end

function love.draw()
  love.graphics.print("resize1: " .. tostring(resize1), 10, 10)
  love.graphics.print("resize2: " .. tostring(resize2), 10, 30)
end

My machine uses debian 12
love.graphics.getRendererInfo output:
OpenGL;4.3.0 NVIDIA 535.183.01;NVIDIA Corporation;NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2

[slime73]

I haven't been able to reproduce the issue, but I don't have a Linux machine to test on. Can you see if d099da1 fixed it for you?

[MadByteDE]

Fedora 41, Wayland, KDE 6.2
OpenGL 4.3.0 NVIDIA 560.35.03 NVIDIA Corporation NVIDIA GeForce RTX 4070/PCIe/SSE2

I can confirm that on my Linux machine, the provided code does indeed have different results in resizing between love11 and love12. used the latest action appImage build for love12 with the position fix.

Screencast_20241029_125837.webm

love11 stays centred while love12 does not.

[slime73]

Can you try the latest build? It uses an updated version of SDL3 – I haven't really seen any code changes to it that might affect things, but it's still worth a try I think.

[Endaris]

Behaviour did not change unfortunately

[slime73]

Since the repro has resizable = true, does that mean it doesn't happen when the window is not user-resizable?

[Endaris]

No, the same thing happens actually. I think I initially added it because the context in which I first encountered the issue relied on that.
I don't remember why I stopped trying to get the repro even smaller.