refa: reply2reply panel

tweaks

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/common/widgets/custom_sliver_persistent_header_delegate.dart

@@ -1,3 +1,5 @@
+import 'dart:io' show Platform;
+
 import 'package:flutter/material.dart';
 
 class CustomSliverPersistentHeaderDelegate
@@ -26,7 +28,17 @@ class CustomSliverPersistentHeaderDelegate
     //overlapsContent：SliverPersistentHeader覆盖其他子组件返回true，否则返回false
     return bgColor != null
         ? DecoratedBox(
-            decoration: BoxDecoration(color: bgColor),
+            decoration: BoxDecoration(
+              color: bgColor,
+              boxShadow: Platform.isIOS
+                  ? null
+                  : [
+                      BoxShadow(
+                        color: bgColor!,
+                        offset: const Offset(0, -1),
+                      ),
+                    ],
+            ),
             child: child,
           )
         : child;

lib/common/widgets/interactiveviewer_gallery/interactive_viewer.dart

@@ -846,7 +846,9 @@ class _InteractiveViewerState extends State<InteractiveViewer>
         _currentRotation = desiredRotation;
 
       case _GestureType.pan:
-        assert(_referenceFocalPoint != null);
+        if (_referenceFocalPoint == null) {
+          return;
+        }
         // details may have a change in scale here when scaleEnabled is false.
         // In an effort to keep the behavior similar whether or not scaleEnabled
         // is true, these gestures are thrown away.