Fix the scroll position of the chat view in the sidebar #1302
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When the chat view was in the sidebar, the scroll position of the chat view was reset to the top every time that the sidebar was closed and opened again or the chat tab was selected after changing to a different one.
The reason is that detaching an element and attaching it again, which happens in both scenarios, resets the scroll position of the element, so now the scroll position is explicitly saved before closing the sidebar or unselecting the chat tab and restored again after opening the sidebar or selecting the chat tab again.
How to test (scenario 1):
How to test (scenario 2):
Expected result:
The scroll position of the list of messages is the same as before.
Actual result:
The list of messages is scrolled to the top.