[flutter_inappwebview] Fix crash on webview dispose

[JSUYA]

If WebView releases the ecore_evas used per instance in Dispose(), the EGL display shared with the flutter-tizen renderer is turned off, causing a crash on the next frame.

Share a single Ecore_Evas across all WebViews and never release it.

[gemini-code-assist]

Code Review

This pull request updates the flutter_inappwebview_tizen package to version 0.1.1, modifying WebView to share a single static Ecore_Evas instance instead of creating and freeing one per webview. Feedback on the changes highlights that if the static Ecore_Evas initialization fails initially, it will remain nullptr for all subsequent webview creations. A suggestion is provided to lazily initialize the static pointer to handle potential initial failures robustly.

[JSUYA]

This PR resolves an issue occurring in the integration_test of flutter_inappwebview.

[E] tizen_renderer_egl.cc: PrintEGLError(332) > EGL error: EGL_NOT_INITIALIZED
[E] tizen_renderer_egl.cc: OnMakeCurrent(272) > Could not make the onscreen context current.
[E] [ERROR:flutter/shell/gpu/gpu_surface_gl_skia.cc(220)] Could not make the context current to acquire the frame.
[E] onSigabrt called

[seungsoo47]

Do we need to apply this patch to the flutter_webview_tizen plugin?

[JSUYA]

Do we need to apply this patch to the flutter_webview_tizen plugin?

Yes I will make pr for flutter_webview_tizen/lwe.
I checked to make it the same way in flutter_webview_tizen/lwe, but the structure is slightly different from inappwebview. It might not be necessary.

[seungsoo47]

Do we need to apply this patch to the flutter_webview_tizen plugin?

Yes I will make pr for flutter_webview_tizen/lwe. I checked to make it the same way in flutter_webview_tizen/lwe, but the structure is slightly different from inappwebview. It might not be necessary.

Thank you for the explanation.

[JSUYA]

I confirmed that a crash occurs at evas_object_del(webview_instance_); when running integration_test on the TV emulator(I tested Tizen 10.0 TV Emulator).

✓ Built build/tizen/tpk/org.tizen.flutter_inappwebview_tizen_example-1.0.0.tpk (52.4MB)
Installing build/tizen/tpk/org.tizen.flutter_inappwebview_tizen_example-1.0.0.tpk...         5.4s
VMServiceFlutterDriver: Connecting to Flutter application at http://127.0.0.1:38299/aDDqvb2MRdw=/
VMServiceFlutterDriver: Isolate found with number: 6142057236792791
VMServiceFlutterDriver: Isolate 6142057236792791 is runnable.
VMServiceFlutterDriver: Isolate is paused at start.
VMServiceFlutterDriver: Attempting to resume isolate
[I] 00:00 +0: (setUpAll)
[I] 00:00 +1: load callbacks and navigation controls
VMServiceFlutterDriver: Connected to Flutter application.
[E] flutter_tizen_engine.cc: OnUpdateSemantics(478) > The accessibility bridge must be initialized.
[E] flutter_tizen_engine.cc: OnUpdateSemantics(478) > The accessibility bridge must be initialized.
[E] DotNET onSigsegv called on org.tizen.flutter_inappwebview_tizen_example / DN_izen_example(14759)
Unhandled exception:
DriverError: Failed to fulfill RequestData due to remote error
Original error: ext.flutter.driver: (112) Service has disappeared
Original stack trace:
#0      new _OutstandingRequest (package:vm_service/src/vm_service.dart:278:34)
#1      VmService._call.<anonymous closure> (package:vm_service/src/vm_service.dart:1960:25)
#2      VmService._call (package:vm_service/src/vm_service.dart:1972:8)
#3      VmService.callServiceExtension (package:vm_service/src/vm_service.dart:1911:14)
#4      VMServiceFlutterDriver.sendCommand (package:flutter_driver/src/driver/vmservice_driver.dart:327:12)
#5      FlutterDriver.requestData (package:flutter_driver/src/driver/driver.dart:573:13)
#6      integrationDriver (package:integration_test/integration_test_driver.dart:71:42)
<asynchronous suspension>


#0      VMServiceFlutterDriver.sendCommand (package:flutter_driver/src/driver/vmservice_driver.dart:340:7)
<asynchronous suspension>
#1      FlutterDriver.requestData (package:flutter_driver/src/driver/driver.dart:573:7)
<asynchronous suspension>
#2      integrationDriver (package:integration_test/integration_test_driver.dart:71:29)
<asynchronous suspension>

Additionally, I found that while the test appeared to run correctly in CI, the count was recorded as 0.
(However, since no crash occurred or 'fail' was printed, I think this is simply an aggregation issue.)

flutter_inappwebview example works correctly on the TV emulator, but further investigation is required to determine the exact reason.