nz366

[Feature Request] Multi-Page view mode

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**Motivation** Nice feature to view multiple pages at once **Description** 

This was an effort to bring auto scrolling in iced,

Add ScrollInterCeptionBehavior for toggling autoscroll

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## Summary Briefly describe what this PR changes and why. - Motivation / Context: With current implementation scroll interceptor does not work with trackpads. So chrome like auto-scroll was added....