v3.0.2

Fixed

• A long sample line no longer reflows the block at upgrade. CodeJar writes
  white-space: pre-wrap and overflow-wrap: break-word inline on the block it takes
  over, so a sample whose longest line overflowed the column scrolled sideways before
  upgrade and wrapped after it — one extra visual line per overflowing line, a layout
  shift the height reservation could not see coming. Editable blocks now wear both from
  the start, the same treatment 3.0.1 gave the editor's padding. Same honest edge too: a
  pane read-only by fence word or pane type wraps for the wait and unwraps when the
  editor declines it. The sibling-pane hide crosses the same line now — keyed off
  .is-tabbed instead of :defined, so the later fences cannot stand on the page for
  the one frame between upgrade and the tab strip's collapse taking over. A stray
  non-fence <pre> inside the element stays hidden for good where it used to reappear
  at upgrade; the panes contract never included one.

Full Changelog: v3.0.1...v3.0.2