Nav Two

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Chat Preview is outside the scroll area. When chat is long, cannot scroll down.

Chat Preview is outside the scroll area. Chat has a scroll area and a max height.

Chat Preview and Search Toolbar are in the scroll area. Toolbar is sticky to the top of the scroll area. Chat Preview scrolls off screen.

Example 4

Chat Preview and Search Toolbar are in the scroll area. Chat Preview header is sticky to the top of the area. Expanding chat scrolls area to the top. Chat content scrolls behind the sticky Header. Search Toolbar is sticky to the bottom of the Chat Preview.