Fix Reader TransactionTooLargeException by skipping WebView saved state

[nbradbury]

Description

This PR fixes a long-standing TransactionTooLargeException when ReaderPostPagerActivity is stopped, resolving JETPACK-ANDROID-PCC (71 users / 9,500+ events since April 2024).

The crash event's bundle stats show a single view carrying 1.8 MB of the 1.9 MB saved-state parcel — the ReaderWebView in the post detail fragment. Android caps the Binder transaction that delivers saved instance state at ~1 MB, so the oversized parcel kills the app.

That saved state is never actually used:

• ReaderPostDetailFragment always re-renders the post from local data via ReaderPostRenderer (showPostInWebView), including after recreation.
• The WebView never navigates internally — link clicks are routed externally through ReaderWebViewUrlClickListener.

The fix simply sets android:saveEnabled="false" on reader_webview, removing ~94% of the parcel with no behavior change.

Testing instructions

Reader post detail still renders and restores correctly:

1. Open the Reader and tap a post to open the post detail screen
2. Swipe between a few posts in the pager

• Verify each post renders its content normally

3. Rotate the device (or toggle dark mode) to force an activity recreation

• Verify the post content re-renders correctly after recreation

4. Background the app, then return to it

• Verify the post detail screen is restored without a crash

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Android by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Android
	Build Type	Debug
	Version	pr22969-b8256cc
	Build Number	1493
	Application ID	com.jetpack.android.prealpha
	Commit	b8256cc
	Installation URL	1h10hfa12esa0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Android by scanning the QR code below to install the corresponding build.

	App Name	WordPress Android
	Build Type	Debug
	Version	pr22969-b8256cc
	Build Number	1493
	Application ID	org.wordpress.android.prealpha
	Commit	b8256cc
	Installation URL	2t37ilt8ucdh0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[adalpari]

Nice fix! 🚢 it!