(maint) Limit scope and timing of selection #57
                
     Merged
            
            
          
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Selection is done by the caller as a part of the callbacks registered
via the tab component and tabs. The timing of this callback depeends
on when the tabs are rendered. This applies a bottleneck to ensure
that the tab selection is honored when specified, by delaying selection
until after the render loop for the current tabs are rendered.