Handle yet more edge cases where the standalone tags fail

Joshua Goinsrequested to merge
work/redstrate/standalone-tag-fixes into master

This fixes and adds tests for two more cases where I noticed the standalone tag system acting oddly:

  • Tags that are surrounded by text in its paragraph should no longer be stolen and the paragraph forever looking wierd.
  • Tags that somehow don't end up in their own paragraph, but only separated with a linebreak (
    ) are supported.

Should be backported to 24.02 because it's bugfixes

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