Inserts a pinned page at @position.
It's an error to try to insert a pinned page after a non-pinned page, in that case [method@TabView.insert] should be used instead.
a widget to add
the position to add @child at, starting from 0
the page object representing @child
1.0
See Implementation
Inserts a pinned page at @position.
It's an error to try to insert a pinned page after a non-pinned page, in that case [method@TabView.insert] should be used instead.