use up svg icon

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -710,12 +710,13 @@ class _MessageListViewState extends State<MessageListView> {
                       );
                     }
                   },
-                  child: Transform.rotate(
-                    angle: widget.reverse ? 0 : pi,
-                    child: StreamSvgIcon.down(
-                      color: _streamTheme.colorTheme.textHighEmphasis,
-                    ),
-                  ),
+                  child: widget.reverse
+                      ? StreamSvgIcon.down(
+                          color: _streamTheme.colorTheme.textHighEmphasis,
+                        )
+                      : StreamSvgIcon.up(
+                          color: _streamTheme.colorTheme.textHighEmphasis,
+                        ),
                 ),
                 if (showUnreadCount)
                   Positioned(

packages/stream_chat_flutter/lib/src/stream_svg_icon.dart

@@ -37,6 +37,18 @@ class StreamSvgIcon extends StatelessWidget {
         height: size,
       );
 
+  /// [StreamSvgIcon] type
+  factory StreamSvgIcon.up({
+    double? size,
+    Color? color,
+  }) =>
+      StreamSvgIcon(
+        assetName: 'Icon_up.svg',
+        color: color,
+        width: size,
+        height: size,
+      );
+
   /// [StreamSvgIcon] type
   factory StreamSvgIcon.attach({
     double? size,

packages/stream_chat_flutter/lib/svgs/Icon_up.svg

@@ -0,0 +1,3 @@
+<svg transform="rotate(180)" width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5.30605 8.30597C5.11052 8.50222 5.00073 8.76795 5.00073 9.04498C5.00073 9.322 5.11052 9.58774 5.30605 9.78398L11.2061 15.697C11.4321 15.923 11.7351 16.024 12.0291 16C12.17 16.0032 12.3102 15.9778 12.441 15.9252C12.5718 15.8726 12.6906 15.7939 12.7901 15.694L18.6941 9.78398C18.8898 9.58786 18.9998 9.32208 18.9998 9.04498C18.9998 8.76787 18.8898 8.50209 18.6941 8.30597C18.5972 8.20898 18.4821 8.13203 18.3555 8.07952C18.2289 8.02702 18.0931 8 17.9561 8C17.819 8 17.6832 8.02702 17.5566 8.07952C17.43 8.13203 17.3149 8.20898 17.2181 8.30597L11.9981 13.533L6.78005 8.30597C6.68327 8.20901 6.56831 8.13208 6.44176 8.07959C6.31521 8.0271 6.17956 8.00008 6.04255 8.00008C5.90555 8.00008 5.76989 8.0271 5.64334 8.07959C5.51679 8.13208 5.40184 8.20901 5.30505 8.30597H5.30605Z" fill="black"/>
+</svg>