Text spanning multiple invisible elements can be matched

[koterpillar]

The following step:

Then I should see "A unicorn"

will match on an HTML:

<div>
  <span style="display: none">A</span> <span style="display: none">unicorn</span>
</div>

because even though none of the spans are visible, the outer div is, and it contains the specified text.

Same issue in Aloe Webdriver: aloetesting/aloe_webdriver#13