TF-3622 Add integration test for case deformed inlined image

Signed-off-by: dab246 <tdvu@linagora.com>

core/lib/presentation/views/html_viewer/html_content_viewer_widget.dart

@@ -60,10 +60,10 @@ class HtmlContentViewer extends StatefulWidget {
   }) : super(key: key);
 
   @override
-  State<StatefulWidget> createState() => _HtmlContentViewState();
+  State<StatefulWidget> createState() => HtmlContentViewState();
 }
 
-class _HtmlContentViewState extends State<HtmlContentViewer> {
+class HtmlContentViewState extends State<HtmlContentViewer> {
 
   late InAppWebViewController _webViewController;
   late double _actualHeight;
@@ -79,6 +79,9 @@ class _HtmlContentViewState extends State<HtmlContentViewer> {
     verticalScrollBarEnabled: false,
   );
 
+  @visibleForTesting
+  InAppWebViewController get webViewController => _webViewController;
+
   @override
   void initState() {
     super.initState();