fix: Allow key verification to scroll vertically

lib/components/dialogs/key_verification_dialog.dart

@@ -25,6 +25,7 @@ class KeyVerificationDialog extends StatefulWidget {
 
 class _KeyVerificationPageState extends State<KeyVerificationDialog> {
   void Function() originalOnUpdate;
+  final _scrollController = ScrollController();
 
   @override
   void initState() {
@@ -50,6 +51,7 @@ class _KeyVerificationPageState extends State<KeyVerificationDialog> {
         .contains(widget.request.state)) {
       widget.request.cancel('m.user');
     }
+    _scrollController.dispose();
     super.dispose();
   }
 
@@ -316,17 +318,25 @@ class _KeyVerificationPageState extends State<KeyVerificationDialog> {
             subtitle: Text(L10n.of(context).verifyTitle, maxLines: 1),
             title: userNameTitle,
           );
-    final content = Column(
-      mainAxisSize: MainAxisSize.min,
-      children: [
-        if (PlatformInfos.isCupertinoStyle) ...{
-          SizedBox(height: 8),
-          Center(child: userNameTitle),
-          SizedBox(height: 12),
-        },
-        body,
-        if (bottom != null) bottom,
-      ],
+    final content = Scrollbar(
+      isAlwaysShown: true,
+      controller: _scrollController,
+      child: SingleChildScrollView(
+        scrollDirection: Axis.vertical,
+        controller: _scrollController,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            if (PlatformInfos.isCupertinoStyle) ...[
+              SizedBox(height: 8),
+              Center(child: userNameTitle),
+              SizedBox(height: 12),
+            ],
+            body,
+            if (bottom != null) bottom,
+          ],
+        ),
+      ),
     );
     if (PlatformInfos.isCupertinoStyle) {
       return CupertinoAlertDialog(