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The quick views (Show Hierarchy and Show Outline, Ctrl+T and Ctrl+O) should provide context info for the current selection (type / member), like every ContentAssist does. To avoid cluttering the screen, the additional info could only be shown when a tree item is active (and not when the search text line has focus).
It's not a content assist. If you want to see the Javadoc either use the Javadoc view or jump to the corresponding method.
Get rid of deprecated state.