Philipp Mildenberger 24427bbb44 Use `ViewMarker` trait instead of the generic `Marker` to allow `impl ViewSequence` as return type (#472) ... This allows returning `impl ViewSequence` as this was previously not possibly as the `Marker` generic parameter couldn't be named (easily) in `ViewSequence<..., Marker>`. This also provides specialized `ViewSequence`s for xilem (`WidgetViewSequence` and `FlexSequence`) as well as for xilem_web (`DomFragment`). Additional doc-tests/documentation and a small example (in `counter`) for xilem_web is provided as well. This has the drawback to not being able to reeimplement `ViewSequence` for types that already implement `View`, which was previously possible (as seen by the now removed `NoElementView` `ViewSequence` implementation). And additionally by introducing more boilerplate by having to implement `ViewMarker` for every type that implements `View`. --------- Co-authored-by: Daniel McNab <36049421+DJMcNab@users.noreply.github.com>		2024-08-05 10:53:19 +00:00
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mod.rs	Use `ViewMarker` trait instead of the generic `Marker` to allow `impl ViewSequence` as return type (#472)	2024-08-05 10:53:19 +00:00