From fa957db272f0adb2d3bc1f881c91de9b1ccee6f0 Mon Sep 17 00:00:00 2001
From: Wu Cheng-Han <jacky_cute0808@hotmail.com>
Date: Fri, 25 Sep 2015 18:05:50 +0800
Subject: [PATCH] Updated updateView, now will updateHistory in editor changes
 event, support preventSyncScroll and workaround editor might scroll to no
 where on changes in the doc bottom

---
 public/js/index.js      | 7 ++++++-
 public/js/syncscroll.js | 6 ++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/public/js/index.js b/public/js/index.js
index 244b6aa53..bfb793c2a 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -1596,6 +1596,12 @@ editor.on('beforeChange', function (cm, change) {
             break;
         }
     }
+editor.on('changes', function (cm, changes) {
+    updateHistory();
+    preventSyncScroll = true;
+    var scrollInfo = editor.getScrollInfo();
+    editor.scrollTo(null, scrollInfo.top - 1);
+    editor.scrollTo(null, scrollInfo.top);
 });
 editor.on('focus', function (cm) {
     for (var i = 0; i < onlineUsers.length; i++) {
@@ -1731,7 +1737,6 @@ function updateViewInner() {
     generateToc('toc-affix');
     generateScrollspy();
     smoothHashScroll();
-    writeHistory(ui.area.markdown);
     isDirty = false;
     clearMap();
     buildMap();
diff --git a/public/js/syncscroll.js b/public/js/syncscroll.js
index a9eafe488..143e668e8 100644
--- a/public/js/syncscroll.js
+++ b/public/js/syncscroll.js
@@ -139,6 +139,8 @@ md.renderer.rules.code = function (tokens, idx /*, options, env */ ) {
     return '<code>' + Remarkable.utils.escapeHtml(tokens[idx].content) + '</code>';
 };
 
+var preventSyncScroll = false;
+
 //var editorScrollThrottle = 100;
 var buildMapThrottle = 100;
 
@@ -299,6 +301,10 @@ function getEditorLineNoByTop(top) {
 
 function syncScrollToView(event, _lineNo) {
     if (currentMode != modeType.both) return;
+    if (preventSyncScroll) {
+        preventSyncScroll = false;
+        return;
+    }
     var lineNo, posTo;
     var scrollInfo = editor.getScrollInfo();
     if (!scrollMap || !lineHeightMap) {