Ignore ancestor opacity for open popovers and modal dialogs

[lukasedw]

Problem

isVisible walks every ancestor of a node and reports hidden if any of them has display: none, visibility: hidden or opacity: 0. A popover or a modal <dialog> renders in the top layer once shown, so it's actually on screen even under an opacity: 0 ancestor, but isVisible still reports it hidden:

<div style="opacity: 0"><div id="menu" popover>menu</div></div>

page.execute_script("document.getElementById('menu').showPopover()")
expect(page).to have_css("#menu") # fails; the menu is on screen

Fix

Ancestor opacity stops applying past an open popover or a modal dialog, since they render in the top layer; the display and visibility checks are unchanged.

Testing

Three specs under Node#visible. The first two fail on main; the third is a guard that already passes. Suite and rubocop pass.