I haven't been able to reproduce this yet, but this may have been fixed in the master branch since the GTK4 port changed a bit of that code
https://github.com/PintaProject/Pinta/blob/master/Pinta.Core/Managers/ToolManager.cs#L249 vs https://github.com/PintaProject/Pinta/blob/gtk3/Pinta.Core/Managers/ToolManager.cs#L242
I haven't been able to reproduce this yet, but this may have been fixed in the master branch since the GTK4 port changed a bit of that code
https:/ /github. com/PintaProjec t/Pinta/ blob/master/ Pinta.Core/ Managers/ ToolManager. cs#L249 /github. com/PintaProjec t/Pinta/ blob/gtk3/ Pinta.Core/ Managers/ ToolManager. cs#L242
vs
https:/