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I got this error on an ubuntu 22.04, I actually don't know what graphics device it has, System information says "Unknown", it's a Dell Optiplex 9020.
Its lists as "Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller" although i don't have an xeon cpu.
As noted in discord this is almost certainly caused by this code: https://github.com/wesnoth/wesnoth/blob/51b65dac8503a8f5bf5a1c79038a5203a7e833cd/src/gui/core/canvas.cpp#L515 which caches the background to blur it in software.
Happens to me too, the affected zoom levels are 0.33333333, 0.5 and 1.5
M first idea here would be to first assemble the map from it tiles, an then zoom the assembed map instead of zooming the tiles seperately and then placing them...
For reference I tested with Intel integrated GPU .
> Like if it's supposed to scale to 24x24 pixels you could tell it to scale to 24.25 x 24.25 and it might remove the seams. Or tell it to...
> Scaling or offsetting by less than half a pixel (in the target size) should cause no difference in final rendering, but clears up the ambiguity by making each of...
okay it seems like `SDL_RenderCopyF`is actualyl a thing... maybe we should try that one out eventually.
So i tried to fix it by using the mentioned method of making the blit target a little bit larger by 0.25, and i now get grey artifacts on fogged...