Emilio Cobos Álvarez 5dcfa83235 Bug 1794720 - fix invalidation of sibling combinators in different slots. r=firefox-style-system-reviewers,layout-reviewers,boris
This extends the code to deal with sibling invalidation to handle the
case where the flat tree doesn't match the DOM tree. In the test-case
for example, dom is:

 * details
   * summary id=a
   * summary

But flat tree is:

 * details
  * slot
    * summary id=a
  * slot
    * summary

Differential Revision: https://phabricator.services.mozilla.com/D159150
2022-10-20 08:39:18 +00:00
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