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[web] Render in custom target (flutter#37738)
* Introduce FullScreenApplicationDom, and wire it to meta viewport, event handlers and hot restart. * Move internal stylesheet to HostNode from ViewEmbedder. * Add setHostStyles and Attribute to ApplicationDom. Use it in the embedder. * Move HotRestartCacheHandler to its own file. * Remove Safari hack for visualViewport. * No need to keep a ref to the viewport meta in full-screen. * Add applicationDom.attachGlassPane and use it in the Embedder. * Remove empty method bodies. * Add attachResourcesHost and use it from the embedder. * Removed some unused code. * Some more cleanup. * Add ResizeObserver JS interop API. * Add the CustomElementApplicationDom and wire it to the ViewEmbedder. * Add the DimensionsProvider classes. * Reimplement engine.window using the DimensionsProvider. * Delegate window metrics to engine window in html scene object. * Wire DimensionsProvider into engine.window. * Moved ApplicationDom into its own subdir. * Make DimensionsProvider also an Observer. Expose onResize Stream. * Delegate onResize and dpr from window to DimensionsObserver object. * Remove or make most ApplicationDom methods private. Expose single initializeHost. * Hook the new API. * dart format * ApplicationDom -> EmbeddingStrategy. * Attach pointer move events to glassPaneElement * Use offset positions for mouse events (relative to host element) rather than client (relative to viewport) * Update TouchAdapter to understand scrolling (simulate offsetX/Y) * Remove locale change handling from the embedding strategy. Also, remove DomSubscription handling from the hot_restart_cache_handler, now that it is not needed. * Move locale handling from the embedder to the platform dispatcher * Move some styles from host to glassPane so we are more friendly with external CSS. * Make analyzer fixes * Ensure DimensionsProvider is available in tests. * Initialize the view DimensionsProvider next to where the EmbeddingStrategy is decided (more logical) * Bring back the logic to support Firefox 83. * Fix pointer_binding test for new anchor point in the DOM. * Fix pointer_binding_test in Firefox. * Add an iterable way of accessing 'rules' From a CSSStyleSheet object. Also add the cssText getter for a CSSRule so we can parse it later. * Merge latest changes to host_node stylesheet. * Add an id to the StyleSheet element that we add, so it can be selected later (in tests). * Use the methods coming from browser_detection.dart to determine the browser runtime, instead of re-implementing them within the method. * Merge the Edge stylesheet into the general one. * Update tests so they can look at the CSS Rules that were added. * Format test * Try to use insertRule for -ms-reveal, and fallback in tests. * Test hot_restart_cache_handler Simplify API a little bit, make clear method private. * Test dimensions_provider. * Test full_page_dimensions_provider * Test custom_element_dimensions_provider * Test embedding_strategy. Make getDomCache util public. * Fixes and tests for *_embedding_strategy. * Move default text colors to our innermost style inside host_node (apply only to flt-scene-host). Remove code from the embedding strategies, and adjust tests. * Safari expands shorthand properties in CSSOM. Check individually for both font-family and font-size in Safari, rather than font in the host_node_test. * Add computeEventOffsetToTarget function, and use it. * Address PR comments. * Update licenses_flutter. * Remove DomCSSRuleList class and instead use Iterable of DomCSSRule * Make the embeddingStrategy final instead of late * Attach mouse/pointermove events to domWindow. * Rename DimensionsProvider.onHotRestart to .close, and slightly improve docs. * Fix compute physicalX/Y for TalkBack events. Extracted compute function to a helper file. * Clarify what does (and does not) support 3D transforms in the event_position_helper file. * Update licenses file
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