Fix row index update direction in editorDelRow #115
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Fixes #114
editorDelRow() uses idx++ to update row indices after deletion, but it should be idx--. Rows shift up when deleted (the inverse of insertion), so their indices must decrease. The wrong direction corrupts row.idx, which breaks editorUpdateSyntax() — it uses row->idx + 1 to propagate comment state to the next row, but the inflated index makes the bounds check fail and propagation stops silently.