Multi monitor with mixed DPIs absolutely does not work well in x11 in 2025. I don’t know about 20+ years ago.
It could, though. GTK has support for mixed DPI, just only for Wayland. There's no reason why it couldn't work on X11. It might be more tricky to get right, but it's just a matter of work.
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It could, though. GTK has support for mixed DPI, just only for Wayland. There's no reason why it couldn't work on X11. It might be more tricky to get right, but it's just a matter of work.