Cursor events are not created if no buttton are pressed

[tormol]

[chrisrharris]

Is this issue possibly the reason why set_mouse_capture on a glutin window doesn't seem to be capturing mouse movement? I changed the window back-end in the Piston cube example to glutin, and it fails to capture the mouse events for the first person camera. (Ubuntu Gnome 15)

[zmoshansky]

I just noticed e.cursor_args only works on glutin if a button is being held down when it exits the window (Works fine in SDL2). Looking at the commit where it's implemented, it looks like the code is correct. It makes me think that maybe E::MouseMoved((x, y)) isn't triggered when the mouse leaves the window unless a button is pressed.