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Need to improve user experience with virtual scrolling in the EJ2 Scheduler

In the Scheduler's virtual scrolling functionality, frequent flashing occurs during data loading while scrolling (even for a single scroll), as the buffer count is currently set to 3 by default. This behavior involves clearing all the current data, fetching new data from the server, and rendering it, causing a noticeable delay between clearing and rendering.

Video attached as a zip file.

Goal 1: Enhance the user experience by retaining the current data while scrolling and render only the newly fetched data from the server, thereby eliminating the frequent loading effect. 

Goal 2:  Provide support for a configurable buffer count property, allowing users to increase it as needed from the sample end.