[Fix] IllegalArgumentException: in ReaderPostRenderer

[zwarm]

Fixes #20996

This PR is an attempt to fix IllegalArgumentException: jsObjectName wvHandler was already added.

The exception we are encountering indicates that the wvHandler JavaScript object name is being added multiple times to the WebView, which is not allowed. This can happen if setWebViewMessageHandler is called more than once for the same WebView instance without removing or properly handling the previously added JavaScript object.

To avoid this issue, this PR sets a tag on the webview and checks for the instance of that tag before the jsObject is added again.

Note: I was unable to recreate the issue, so please feel free to block this fix.

To Test:

As the issue can't be recreated, please test that the existing functionality works as expected. These test instructions were taken from #20895, as this is when the code was added.

• Open Jetpack
• Make sure data collection is enabled in App Settings -> Privacy
• Go to Reader
• Go to any post
• Select some text
• Verify the reader_article_text_highlighted event is tracked (use logcat)
• Tap on Copy in the context menu
• Verify the reader_article_text_copied event is tracked

---

Regression Notes

1. Potential unintended areas of impact
   The crash still happens

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Manual testing

3. What automated tests I added (or what prevented me from doing so)
   N/A

---

PR Submission Checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

---

Testing Checklist (strike-out the not-applying and unnecessary ones): N/A

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 25.1 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by 🚫 Danger

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[wpmobilebot]

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

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20997-cfd8b51
	Commit	cfd8b51
	Direct Download	jetpack-prototype-build-pr20997-cfd8b51.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

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

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20997-cfd8b51
	Commit	cfd8b51
	Direct Download	wordpress-prototype-build-pr20997-cfd8b51.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 40.98%. Comparing base (9e26ec5) to head (cfd8b51).

Files	Patch %	Lines
...ordpress/android/ui/reader/ReaderPostRenderer.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release/25.1   #20997      +/-   ##
================================================
- Coverage         40.99%   40.98%   -0.01%     
================================================
  Files              1522     1522              
  Lines             69622    69625       +3     
  Branches          11489    11490       +1     
================================================
  Hits              28539    28539              
- Misses            38494    38497       +3     
  Partials           2589     2589              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[irfano]

I also couldn't reproduce the crash but your solution looks reasonable to me. LGTM! 👍🏻