Fix corruption on section break in parts#26308

Merged

mike-spa merged 2 commits intomusescore:masterfrom mike-spa:fixCorruptionOnSectionBreakInParts

Feb 5, 2025

Commits on Feb 4, 2025

Instead of setting z during layout, move LAYOUT_BREAK up the list in the ElementType enum to ensure it stays behind all notation
mike-spa
committed
Set LayoutBreak elements to track 0 instead of muse::nidx
mike-spa
committed