Michael Rawlings df79fcc5f0
Diffing/Keying fixes (#1094)
* Updates the diffing algorithm to use an HTMLFragment node as an abstraction rather than keeping track of startNode and endNode all throughout the diffing algorithm.

* Uses the HTMLFragment for the <${dynamic}> tag and <include> tags to preserve server-rendered content for which the renderBody is not available in the browser.

* Component ids are based on the resulting parent tree (not the owner tree). This means we cannot rely on the ids in the global lookup, so component key/refs are now also stored on the component instance.

* Static node trees are now only auto assigned a key for the top-level node (instead of all nodes).

* Server comment starting markers now have the component's key serialized so the component can be attached to its owner

* Server comment markers no longer have the id on the closing marker, it is stack based.

* Normalize differences between hydration and client-rendering, so post mount the DOM looks the same regardless of whether a component was server or client rendered.

* fix matching up fragments when hydrating by taking components and normalized text nodes into account

* remove wrapping divs in test, should no longer be needed.  address hydration issue with alternate fragment matching approach.

* add fragment to dom if there's a parentNode even if no startNode

* add test for mismatched hydration

* don't detach components before moving

* use fragments to preserve renderBody content

* use ___finishFragment as the incomplete fragment marker

* ensure fragments get destroyed properly and dom node key sequences don't continue from previous renders

* use parent/owner terminology in more places, component ids are now parent scoped, key/ref components are attached to their owner for both client + server render, server comment boundaries include the owner and the key in addition to the fully scoped component id, autokeyed dom nodes are attached to their parent, hydration now uses a stack: ids in ending comment nodes not needed, hydration checks to see if a component has been initialized and will attach keys directly to the owner if so

* add mutation guards for text/comment nodes, add mutation guard for input value

* make component-pages test better represent streaming hydration, fix html/head/body hydration in a better/more generic way

* add test for async rendered keyrefs

* add test for repeated mult-level transclusion

* Autokeyed elements are now stored on the parent rather than the owner. User assigned key/refs are still stored on the owner component. Because of this, user assigned keys are now prefixed (with @) to differentiate them from autokeys. This also has the benefit that assigning numeric keys can no longer conflict with the autokeys.

* add re-rendering the intermediate container to one of the new tests
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