Regression: mouse cursor and pop up placement from 21.0.6 to 21.0.8

I tried Rider 2025.2 and 2025.3 both with jbr 21.0.6-b895.109 and 21.0.8-b1148.57. With the former there are no problems, but with the latter a basic mouse pointer is shown instead of the system one and pop ups (context menus, tool-tips, floating windows) are placed partially outside the screen boundaries.

I use NixOs GNU/Linux (tried with both 25.05 and 25.11) with i3 wm (x11).

Reading the logs in `~/.cache/JetBrains/Rider2025.*/log/idea.log` I couldn't find nothing relevant.

Reproduce the cursor and pop-up placement differences in Rider 2025.2 or 2025.3 using JBR 21.0.6-b895.109 and 21.0.8-b1148.57 on NixOS with i3 over X11. Start by comparing the relevant entries in ~/.cache/JetBrains/Rider2025.*/log/idea.log and investigate the runtime change; done means the system cursor appears and context menus, tool-tips, and floating windows remain within screen boundaries.

Written by the indexing model from the issue text.