set_needs_attention

Sets whether this needs attention.

[class@TabBar] will display a line under the tab representing the page if set to `TRUE`. If the tab is not visible, the corresponding edge of the tab bar will be highlighted.

[class@TabOverview] will display a dot in the corner of the thumbnail if set to `TRUE`.

[class@TabButton] will display a dot if any of the pages that aren't selected have [property@TabPage:needs-attention] set to `TRUE`.

Parameters:

this	a tab page
needs_attention	whether this needs attention