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GutenbergView previously extended WebView directly and delegated all loading UI (progress bar, spinner, error states) to consumers via the EditorLoadingListener interface. This forced every app embedding the editor to implement its own loading UI boilerplate. This change makes GutenbergView extend FrameLayout instead, containing an internal WebView plus overlay views for loading states: - EditorProgressView (progress bar + label) during dependency fetching - ProgressBar (circular/indeterminate) during WebView initialization - EditorErrorView (new) for error states The view manages its own state transitions with 200ms fade animations, matching the iOS EditorViewController pattern. The EditorLoadingListener interface is removed entirely — consumers no longer need loading UI code. Changes: - GutenbergView: WebView -> FrameLayout with internal WebView child - New EditorErrorView for displaying load failures - Delete EditorLoadingListener (no longer needed) - Simplify demo EditorActivity by removing ~90 lines of loading UI - Update tests to use editorWebView accessor for WebView properties - Delete unused activity_editor.xml layout Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Cancel in-flight view animations in onDetachedFromWindow Prevents withEndAction callbacks from firing on detached views if the editor is closed mid-animation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Remove unused LoadingState enum from GutenbergView Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Remove unused ASSET_LOADING_TIMEOUT_MS constant from GutenbergView Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…edFromWindow These two listeners were not being nulled out during teardown, inconsistent with all other listener cleanup in the same method. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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What?
Moves the editor loading UI from #316 into its own PR
Why?
The smaller change is easier to validate.
How?
Adds loading UI – if you test with the sample app, you'll see that it was removed from the activity and added to the view.