Unions spatial-query child boxes into one axis-aligned WCS rectangle.
Non-finite child boxes (for example deferred MText placeholders seeded with ±Infinity) are skipped so the union matches AcTrGroup.syncWcsBboxFromChildBoxes.
±Infinity
Optional
Unions spatial-query child boxes into one axis-aligned WCS rectangle.
Non-finite child boxes (for example deferred MText placeholders seeded with
±Infinity) are skipped so the union matches AcTrGroup.syncWcsBboxFromChildBoxes.