Tweak focus tests

Tweak focus tests

These tests are a bit fragile because the initial focus
that is taken depends on what ends up in the center of
the window, horizontally or vertically, which depends
on things like fonts, or theme spacing.

This commit makes some tweaks to push things in the
widget-factory example around far enough to make the
tests work again.

We should figure out a way to make this more robust.