From fcbd5c88f472b3d3405d199e8030497376d57e66 Mon Sep 17 00:00:00 2001
From: yi0713 <kurage.cc@gmail.com>
Date: Wed, 7 Nov 2018 18:58:18 +0900
Subject: [PATCH] Revert "Temporarily hold timeline if mouse moved recently
 (fixes #8630) (#9200)"

This reverts commit 6a1216d2cd1c26c22baf86ae618a62aa66817239.
---
 .../mastodon/components/scrollable_list.js    | 50 +------------------
 1 file changed, 2 insertions(+), 48 deletions(-)

diff --git a/app/javascript/mastodon/components/scrollable_list.js b/app/javascript/mastodon/components/scrollable_list.js
index e51c83c2b81fc2..5c888650c37133 100644
--- a/app/javascript/mastodon/components/scrollable_list.js
+++ b/app/javascript/mastodon/components/scrollable_list.js
@@ -9,8 +9,6 @@ import { List as ImmutableList } from 'immutable';
 import classNames from 'classnames';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../features/ui/util/fullscreen';
 
-const MOUSE_IDLE_DELAY = 300;
-
 export default class ScrollableList extends PureComponent {
 
   static contextTypes = {
@@ -39,8 +37,6 @@ export default class ScrollableList extends PureComponent {
 
   state = {
     fullscreen: null,
-    mouseMovedRecently: false,
-    scrollToTopOnMouseIdle: false,
   };
 
   intersectionObserverWrapper = new IntersectionObserverWrapper();
@@ -64,47 +60,6 @@ export default class ScrollableList extends PureComponent {
     trailing: true,
   });
 
-  mouseIdleTimer = null;
-
-  clearMouseIdleTimer = () => {
-    if (this.mouseIdleTimer === null) {
-      return;
-    }
-    clearTimeout(this.mouseIdleTimer);
-    this.mouseIdleTimer = null;
-  };
-
-  handleMouseMove = throttle(() => {
-    // As long as the mouse keeps moving, clear and restart the idle timer.
-    this.clearMouseIdleTimer();
-    this.mouseIdleTimer =
-      setTimeout(this.handleMouseIdle, MOUSE_IDLE_DELAY);
-
-    this.setState(({
-      mouseMovedRecently,
-      scrollToTopOnMouseIdle,
-    }) => ({
-      mouseMovedRecently: true,
-      // Only set scrollToTopOnMouseIdle if we just started moving and were
-      // scrolled to the top. Otherwise, just retain the previous state.
-      scrollToTopOnMouseIdle:
-        mouseMovedRecently
-          ? scrollToTopOnMouseIdle
-          : (this.node.scrollTop === 0),
-    }));
-  }, MOUSE_IDLE_DELAY / 2);
-
-  handleMouseIdle = () => {
-    if (this.state.scrollToTopOnMouseIdle) {
-      this.node.scrollTop = 0;
-      this.props.onScrollToTop();
-    }
-    this.setState({
-      mouseMovedRecently: false,
-      scrollToTopOnMouseIdle: false,
-    });
-  }
-
   componentDidMount () {
     this.attachScrollListener();
     this.attachIntersectionObserver();
@@ -118,7 +73,7 @@ export default class ScrollableList extends PureComponent {
     const someItemInserted = React.Children.count(prevProps.children) > 0 &&
       React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
       this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
-    if ((someItemInserted && this.node.scrollTop > 0) || this.state.mouseMovedRecently) {
+    if (someItemInserted && this.node.scrollTop > 0) {
       return this.node.scrollHeight - this.node.scrollTop;
     } else {
       return null;
@@ -138,7 +93,6 @@ export default class ScrollableList extends PureComponent {
   }
 
   componentWillUnmount () {
-    this.clearMouseIdleTimer();
     this.detachScrollListener();
     this.detachIntersectionObserver();
     detachFullscreenListener(this.onFullScreenChange);
@@ -197,7 +151,7 @@ export default class ScrollableList extends PureComponent {
 
     if (isLoading || childrenCount > 0 || !emptyMessage) {
       scrollableArea = (
-        <div className={classNames('scrollable', { fullscreen })} ref={this.setRef} onMouseMove={this.handleMouseMove}>
+        <div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
           <div role='feed' className='item-list'>
             {prepend}