Automatically change the size of textarea (#2128)

app/assets/javascripts/components/components/autosuggest_textarea.jsx

@@ -63,6 +63,10 @@ const AutosuggestTextarea = React.createClass({
       this.props.onSuggestionsClearRequested();
     }
 
+    // auto-resize textarea
+    e.target.style.height = 'auto';
+    e.target.style.height = `${e.target.scrollHeight}px`;
+
     this.props.onChange(e);
   },
 

app/assets/stylesheets/components.scss

@@ -1196,7 +1196,6 @@ a.status__content__spoiler-link {
   display: block;
   box-sizing: border-box;
   width: 100%;
-  resize: none;
   margin: 0;
   color: $color1;
   padding: 10px;
@@ -1220,11 +1219,17 @@ a.status__content__spoiler-link {
 }
 
 .autosuggest-textarea__textarea {
-  height: 100px;
+  min-height: 100px;
   background: $color5;
   border-radius: 4px 4px 0 0;
   padding-bottom: 0;
   padding-right: 10px + 22px;
+  resize: none;
+
+  @media screen and (max-width: 600px) {
+    height: 100px !important; // prevent auto-resize textarea
+    resize: vertical;
+  }
 }
 
 .autosuggest-textarea__suggestions {