fix bugs

src/Common.js

@@ -360,15 +360,17 @@ export class SafeTextarea extends Component {
     );
   }
 
-  set(text) {
+  set(text, keep_pos = false) {
     this.change_callback(text);
-    let currPos = this.area_ref.current.selectionStart;
+    let currPosStart = this.area_ref.current.selectionStart;
+    let currPosEnd = this.area_ref.current.selectionEnd;
     this.setState(
       {
         text: text,
       },
       () => {
-        this.area_ref.current.setSelectionRange(currPos, currPos);
+        if (keep_pos)
+          this.area_ref.current.setSelectionRange(currPosStart, currPosEnd);
         this.area_ref.current.focus();
       },
     );

src/Flows.js

@@ -1109,10 +1109,10 @@ class FlowItemRow extends PureComponent {
         }
       }
 
-    let replies_to_show = this.state.replies.slice(0, PREVIEW_REPLY_COUNT);
     if (mode === 'list' && submode === 1) {
-      replies_to_show.reverse();
+      this.state.replies.reverse();
     }
+    let replies_to_show = this.state.replies.slice(0, PREVIEW_REPLY_COUNT);
 
     let res = (
       <div

src/UserAction.js

@@ -691,7 +691,7 @@ export class PostForm extends Component {
       '\n' +
       (file_type.startsWith('image/') ? `![](${url})` : url);
     this.setState({ text: new_text });
-    this.area_ref.current.set(new_text);
+    this.area_ref.current.set(new_text, true);
   }
 
   upload_progress(event) {