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/Flows.js

@@ -281,7 +281,7 @@ class FlowSidebar extends PureComponent {
     }
 
     show_reply_bar(name,event) {
-        if(this.reply_ref.current && event.target.tagName.toLowerCase()!=='a') {
+        if(this.reply_ref.current && !event.target.closest('a')) {
             let text=this.reply_ref.current.get();
             if(/^\s*(Re (洞主|\b[A-Z][a-z]+){0,2}:)?\s*$/.test(text)) {// text is nearly empty so we can replace it
                 let should_text='Re '+name+': ';