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Since Alpine 3.15.9, keyed x-for moves only the item element and, for x-if, its single rendered element. The content of x-fragment, x-when and x-match was rendered before the template and was left behind, so reordering mixed up the blocks. Render the content after the template, like x-if, and expose its last node through _x_currentIfEl and _x_lastRenderedEl, so x-for treats the whole block as the item. The shared mutation observer then restores the content of every block in the affected parent right after its template, following nested blocks and x-if. The observer also handles removed nodes and the records produced by deleting nested blocks, and works with Alpine versions that do not expose the last rendered item of x-for or destroy x-if content. Fixes #62
Cover reordering, adding, removing and toggling the items of a keyed x-for for x-fragment, x-when and x-match, checking the exact node layout and that the existing nodes are moved rather than recreated. For x-fragment, check all transitions between the orders of four items. Also cover nested blocks, x-if inside a block and vice versa, a block containing a keyed x-for of blocks, restoring a moved node of a block, keeping the initial content of nested x-if and x-for, and that the observer settles without a feedback loop. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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