From 2c58b05d058e264f1222874ac163613ca94437c5 Mon Sep 17 00:00:00 2001
From: Cheng-Han, Wu
Date: Fri, 17 Jun 2016 15:57:34 +0800
Subject: Revert f32dee3796777b71333b4020535e789352900b82, because workaround
 has better performance and they might needed in some cases

---
 public/js/index.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'public/js')

diff --git a/public/js/index.js b/public/js/index.js
index d6efbef2..e873e732 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -795,7 +795,7 @@ function checkEditorStyle() {
     if (scrollbarStyle == 'overlay' || currentMode == modeType.both) {
         ui.area.codemirrorScroll.css('height', desireHeight + 'px');
         ui.area.codemirrorScroll.css('min-height', '');
-        editor.refresh();
+        checkEditorScrollbar();
     } else if (scrollbarStyle == 'native') {
         ui.area.codemirrorScroll.css('height', '');
         ui.area.codemirrorScroll.css('min-height', desireHeight + 'px');
@@ -835,7 +835,7 @@ function checkEditorStyle() {
                         ui.area.view.scroll();
                     });
                 }
-                editor.refresh();
+                checkEditorScrollbar();
             }
         });
         ui.area.resize.handle = $('.ui-resizable-handle');
@@ -876,6 +876,14 @@ function checkSyncToggle() {
     }
 }
 
+function checkEditorScrollbar() {
+    // workaround simple scroll bar knob
+    // will get wrong position when editor height changed
+    var scrollInfo = editor.getScrollInfo();
+    editor.scrollTo(null, scrollInfo.top - 1);
+    editor.scrollTo(null, scrollInfo.top);
+}
+
 function checkTocStyle() {
     //toc right
     var paddingRight = parseFloat(ui.area.markdown.css('padding-right'));
@@ -2509,6 +2517,7 @@ editor.on('changes', function (cm, changes) {
         viewportMargin = newViewportMargin;
         windowResize();
     }
+    checkEditorScrollbar();
 });
 editor.on('focus', function (cm) {
     for (var i = 0; i < onlineUsers.length; i++) {
-- 
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