Scrolling fixes (#3200)

* scrolling fixes:
- jumps on free scroll when somebody posts a new message (and old one disappears at top)
- jumps on closing RHS (no compensation of resize)
- scroll blinking on opening/closing RHS (delay before resize compensation)

* fix scroll slipping up on multiple open/close RHS in case when (this.refs.postlist.offsetHeight % Constants.SCROLL_PAGE_FRACTION === 0)

1 files changed, 2 insertions, 4 deletions

diff --git a/webapp/components/sidebar_right.jsx b/webapp/components/sidebar_right.jsx
index 22ddfc205..9e2fc32dd 100644
--- a/webapp/components/sidebar_right.jsx
+++ b/webapp/components/sidebar_right.jsx
@@ -10,8 +10,6 @@ import PostStore from 'stores/post_store.jsx';
 import UserStore from 'stores/user_store.jsx';
 import * as Utils from 'utils/utils.jsx';
 
-const SIDEBAR_SCROLL_DELAY = 500;
-
 import React from 'react';
 
 export default class SidebarRight extends React.Component {
@@ -55,8 +53,8 @@ export default class SidebarRight extends React.Component {
         const isOpen = this.state.searchVisible || this.state.postRightVisible;
         const willOpen = nextState.searchVisible || nextState.postRightVisible;
 
-        if (!isOpen && willOpen) {
-            setTimeout(() => PostStore.jumpPostsViewSidebarOpen(), SIDEBAR_SCROLL_DELAY);
+        if (isOpen !== willOpen) {
+            PostStore.jumpPostsViewSidebarOpen();
         }
     }
     doStrangeThings() {