Patches and Fragment

Patches<S> is what a handler returns: new signal values and re-rendered fragments, which the browser applies in order.

Patches

Item	Summary
`Patches::new`	An empty batch.
`signals`	Sets signals in the browser.
`list`	Changes items of list signals in the browser, sending only the items that change.
`all_signals`	Replaces every signal with the values in `signals`.
`element`	Re-renders `fragment` and morphs it into the element with its id.
`navigate`	Loads the page at `url` once the patches before it are applied.
`push_url`	Shows `url` in the address bar as a new history entry, without loading it.
`replace_url`	Shows `url` in the address bar in place of the current URL, without loading it.
`to_event_stream`	The batch as a Server-Sent Events body, for use without the axum feature.
`value_of`	The value the batch leaves `signal` at, for a test of an action.
`navigates_to`	The URL of the first `navigate` in the batch, for a test.
`replaces`	Whether the batch re-renders the fragment `F`, for a test.
`SignalPatch`	New values for one or more signals of `S`.
`SignalPatch::and`	Adds the values in `other`. A signal present in both takes `other`'s value.
`ListPatch`	Item changes to list signals of `S`, sent without the rest of each list.
`ListPatch::and`	Adds the changes in `other`, applied after the ones in `self`.

Item	Summary
`Fragment`	A part of the page that the server can re-render and replace without the rest of the page.
`Fragment::ID`	The element id of the fragment's root.
`Fragment::render`	Renders the fragment's root element.
`fragment`	Renders `fragment` with its root id set to `Fragment::ID`.