Merge branch 'ios-autofocus' into 'develop'

Fix iOS autofocus bug, fixes #630

Closes #630

See merge request soapbox-pub/soapbox-fe!491

app/soapbox/features/compose/components/compose_form.js

@@ -166,8 +166,12 @@ class ComposeForm extends ImmutablePureComponent {
   }
 
   componentDidMount() {
+    const length = this.props.text.length;
     document.addEventListener('click', this.handleClick, true);
-    this.setCursor(this.props.text.length); // Set cursor at end
+
+    if (length > 0) {
+      this.setCursor(length); // Set cursor at end
+    }
   }
 
   componentWillUnmount() {