'Flutter CustomScrollView how to keep the viewport when adding item at the start of the list?
Problems: For example, there is a list of 100 messages. The current viewport of CustomCrollView is showing message 50 -> 60. When adding a new item to the start of the list, the viewport jumps to message 49 (old) -> 59 (old) (because the scroll offset is not changed so it shifts the content down).
Expected: After adding item, the viewport should keep showing message 50 (old) -> 60 (old).
How can I implement that?
Sources
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Source: Stack Overflow
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