Control for holding [Viewport]s. A [Container] node that holds a [Viewport], automatically setting its size. [b]Note:[/b] Changing a ViewportContainer's [member Control.rect_scale] will cause its contents to appear distorted. To change its visual size without causing distortion, adjust the node's margins instead (if it's not already in a container). If [code]true[/code], the viewport will be scaled to the control's size. Divides the viewport's effective resolution by this value while preserving its scale. This can be used to speed up rendering. For example, a 1280×720 viewport with [member stretch_shrink] set to [code]2[/code] will be rendered at 640×360 while occupying the same size in the container. [b]Note:[/b] [member stretch] must be [code]true[/code] for this property to work.