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Ulf Hermann authored
Every time a batch root is added or removed the whole scene is rebuilt. Instead of using the "visible" property we can collapse items to a height of 0 in order to make them invisible while keeping them in the scene. This avoids the rebuilds. Change-Id: Icc6dddb8c8f892a37ef4ed5bced501e5f1658d80 Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
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