bug fixes

- click handler event binding
- click handler on img elem
- trailing space in content
- sidebar will-change optimization
- sidebar auto to top
- sidebar not closed after post
- reply form bottom position

src/Title.js

@@ -138,7 +138,7 @@ class ControlBar extends PureComponent {
                             this.props.show_sidebar(
                                 '发表树洞',
                                 <PostForm token={token} on_complete={()=>{
-                                    this.props.show_sidebar('',null);
+                                    this.props.show_sidebar(null,null);
                                     this.do_refresh();
                                 }} />
                             )