I’m blending with a two button mouse these days, until I can replace my nice trackball that gave up its ghost last week, and this has led me to notice a bug in Blender.
It is important to know that I am using the XFree setting Emulate3Buttons, which causes a simultaneous left and right click to register as a middle click.
I do any operation, for example, move some vertices. Then I accidentally control-leftclick and add a vertext to the mesh. But the add vertex operation does not register in the undo list, so if I hit Undo, my move operation is undone.
It seems like that add vertex operation should register in the undo list, but it does not. Is this a bug?