Fix ClassCastException caused by assuming editorFragment was a Gutenb…

[nbradbury]

Closes #21664

This PR fixes a ClassCastException caused by assuming editorFragment was a GutenbergEditorFragment when it could be a GutenbergKitEditorFragment in this code:

   @Subscribe(threadMode = ThreadMode.MAIN)
    fun onEventMainThread(event: ConnectionChangeEvent) {
        if (editorFragment !is GutenbergNetworkConnectionListener) return
        (editorFragment as GutenbergEditorFragment).onConnectionStatusChange(event.isConnected)
    }

Since both of these fragments extend GutenbergNetworkConnectionListener we simply needed to change this to a safe cast for that listener.

@dcalhoun This crash started happening with 25.6, but given this is an experimental feature I wasn't sure if a hotfix was necessary.

To test:

• Set a breakpoint here
• Run the app in debug
• Make sure the experimental editor is enabled
• Edit a post
• Turn on airplane mode
• Note that breakpoint is reached and the app doesn't crash

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[dcalhoun]

LGTM. These testing plan succeeded for me, the crash no longer occurs. Thank you for addressing this! 🙇🏻‍♂️

This crash started happening with 25.6, but given this is an experimental feature I wasn't sure if a hotfix was necessary.

Given the 25.6.1 release has not shipped, I suggest we include this in both the 25.6.1 and 25.7 releases. This crash could occur at any point if a user's network connection intermittently disconnects.

[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	pr21665-8d33633
	Commit	8d33633
	Direct Download	wordpress-prototype-build-pr21665-8d33633.apk

Note: Google Login is not supported on these builds.

[nbradbury]

Given the 25.6.1 release has not shipped, I suggest we include this in both the 25.6.1 and 25.7 releases.

👍 I'll work on PRs for both of these.

[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	pr21665-8d33633
	Commit	8d33633
	Direct Download	jetpack-prototype-build-pr21665-8d33633.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.42%. Comparing base (369805d) to head (8d33633).
Report is 1 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #21665   +/-   ##
=======================================
  Coverage   39.42%   39.42%           
=======================================
  Files        2122     2122           
  Lines       99558    99558           
  Branches    15317    15317           
=======================================
  Hits        39247    39247           
  Misses      56832    56832           
  Partials     3479     3479           

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