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Refactor UIWebView document scene isolation and async resource lifetime.

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Move UIWebView documents into isolated UISceneNode instances, keep document viewport and extent metrics synchronized, and fix shrink/grow behavior after navigation, async CSS, and viewport changes. Scope author styles and font-face resources per document scene, ignore stale async callbacks after navigation or destruction, and add deterministic coverage for CSS, fonts, images, cookies, hit testing, and document extent updates.

Fixes in UIWebView -> doc -> html -> body resizing issues. Added a few tests to catch regressions.
This commit is contained in:
Martín Lucas Golini
2026-07-03 01:33:47 -03:00
parent bc7498c7c4
commit e5751da1a0
13 changed files with 1663 additions and 143 deletions
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.agent/rules/html-layout-architecture.md
+10 -6
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@@ -38,8 +38,8 @@ The application scene and document scene are separate style and resource boundar
- Application stylesheets must not match web-view document nodes.
- Document stylesheets must not match application widgets or sibling web views.
- URI, referer, navigation interception, cookies, dirty style/layout queues, actions, keyframes, and
author `@font-face` aliases are document-scoped state.
- URI, referer, relative-resource resolution, navigation interception, cookies, dirty style/layout
queues, actions, keyframes, and author `@font-face` aliases are document-scoped state.
- Application code that intentionally injects document CSS must use
`UIWebView::getDocumentSceneNode()->combineStyleSheet(...)`.
@@ -54,11 +54,15 @@ Nested document scenes inherit only host services needed to operate inside the e
Do not copy the host stylesheet, URI, referer, navigation callback, cookies, dirty queues, roots,
actions, or icon-theme ownership into a document scene.
The document scene has two independent sizes:
The WebView document topology keeps three document metrics distinct:
- its actual scene extent is content-sized and is the `UIScrollView` scroll target;
- its explicit viewport size is the visible web-view viewport and is used for media queries,
viewport units, HTML/body minimum height, and fixed-position layout.
- **CSS viewport:** the visible web-view viewport, used for media queries, viewport units,
HTML/body minimum height, fixed positioning, and sticky positioning.
- **Layout viewport / initial containing block:** the viewport-sized root layout reference used for
normal root/body layout and percentage descendants.
- **Scrollable overflow extent:** the measured document overflow size. This belongs to the
`UIWebView` document layout scroll target and the nested document scene extent, not to the root
containing block.
Document scenes are owner-updated by `UIWebView::scheduledUpdate()`. Do not register them with
`SceneManager`, and do not add a second update subscription for the same document scene.