A customizable SmoothScrollContainer node for Godot
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Activate the addon in the project settings' addon tab, Click the "+" button to add a new node and select "SmoothScrollContainer" instead "ScrollContainer". To add smooth scrollling to existing ScrollContainers, rightclick the node and select change type. Then select "SmoothScrollContainer".
For smoother scrolling: In your project settings set gui/common/snap_controls_to_pixels to false
Mouse scroll icon by Greg Fiske from the Noun Project