setDefaultIcon

Sets the default page icon for @self.

If a page doesn't provide its own icon via property@TabPage:icon, a default icon may be used instead for contexts where having an icon is necessary.

class@TabBar will use default icon for pinned tabs in case the page is not loading, doesn't have an icon and an indicator. Default icon is never used for tabs that aren't pinned.

class@TabOverview will use default icon for pages with missing thumbnails.

By default, the adw-tab-icon-missing-symbolic icon is used.

Parameters