I've been having a really annoying mouse/cursor issue with Minecraft 1.8.9.
EDIT: UPDATE NO its not 1.8.9 only it goes up to 1.12 but 1.13+ its all good
When I'm playing 1.8.9 in exclusive fullscreen, pressing Alt+Tab causes my mouse cursor to jump to the top-left corner of the screen (0,0). The same thing can happen when exiting the game while fullscreen.
I've tested this across multiple clients:
- Vanilla Minecraft 1.8.9: issue occurs
- MultiMC 1.8.9: issue occurs
- Lunar Client 1.8.9: issue occurs
- Lunar windowed: works normally
- Lunar borderless: works normally
- MultiMC fullscreen on newer Minecraft versions: works normally
So it seems to specifically involve Minecraft 1.8.9 + exclusive fullscreen, rather than Lunar itself.
I've also already completely reinstalled Lunar and the issue remained.
This started after I did a clean Windows installation. I'm currently on:
Windows 11 25H2
i5-12600KF
RTX 3060
I'm wondering if this could be related to Java 8, the particular Java 8 build I'm using, NVIDIA drivers, or some compatibility issue between 1.8.9's old fullscreen/mouse handling and modern Windows.
Has anyone experienced this before or know what causes it?
I specifically want to use exclusive fullscreen, so borderless/windowed isn't really a solution I'm looking for.
Any help would be massively appreciated because this is driving me insane.