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Add optional on-demand rendering
Miikka Heikkinen authored
When on-demand rendering is enabled, the Canvas3D content is rendered
only when the application specifically requests it.

[ChangeLog][Renderer] On-demand rendering

Change-Id: Iacfd1f6746e5972209add469d0138f74964f63d9
Task-number: QTBUG-46519
Reviewed-by: default avatarPasi Keränen <pasi.keranen@digia.com>
6888b12b