From 6b47fb69d077069521998470b6b8d692181a0555 Mon Sep 17 00:00:00 2001
From: John McLear <john@mclear.co.uk>
Date: Sun, 17 Feb 2013 18:01:25 +0000
Subject: [PATCH] seems to be working pretty well

---
 src/static/js/ace2_inner.js | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/static/js/ace2_inner.js b/src/static/js/ace2_inner.js
index 8209c9bf8..70b5443bd 100644
--- a/src/static/js/ace2_inner.js
+++ b/src/static/js/ace2_inner.js
@@ -3731,6 +3731,33 @@ function Ace2Inner(){
             updateBrowserSelectionFromRep();
           }, 200);
         }
+
+        /* Attempt to apply some sanity to cursor handling in Chrome after a copy / paste event
+           We have to do this the way we do because rep. doesn't hold the value for keyheld events IE if the user
+           presses and holds the arrow key */
+        if((evt.which == 37 || evt.which == 38 || evt.which == 39 || evt.which == 40) && $.browser.chrome){
+          var isLeftArrow = evt.which === 37;
+          var isUpArrow = evt.which === 38;
+          var isRightArrow = evt.which === 39;
+          var isDownArrow = evt.which === 40;
+
+          var newVisibleLineRange = getVisibleLineRange(); // get the current visible range -- This works great.
+          var lineHeight = textLineHeight(); // what Is the height of each line?
+          var myselection = document.getSelection(); // get the current caret selection, can't use rep. here because that only gives us the start position not the current
+          var caretOffsetTop = myselection.focusNode.parentNode.offsetTop; // get the carets selection offset in px IE 214
+
+          if((isUpArrow || isLeftArrow || isRightArrow || isDownArrow) && caretOffsetTop){ // was it an up arrow or left arrow?
+            var lineNum = Math.round(caretOffsetTop / lineHeight) ; // Get the current Line Number IE 84
+            var caretIsVisible = (lineNum > newVisibleLineRange[0] && lineNum < newVisibleLineRange[1]); // Is the cursor in the visible Range IE ie 84 > 14 and 84 < 90?
+            if(!caretIsVisible){ // is the cursor no longer visible to the user?
+              // Oh boy the caret is out of the visible area, I need to scroll the browser window to lineNum.
+              // Get the new Y by getting the line number and multiplying by the height of each line.
+              var newY = lineHeight * (lineNum -1); // -1 to go to the line above
+              setScrollY(newY); // set the scroll height of the browser
+            }
+          }
+        }
+
       }
 
       if (type == "keydown")
@@ -3836,7 +3863,6 @@ function Ace2Inner(){
     selection.endPoint = getPointForLineAndChar(se);
 
     selection.focusAtStart = !! rep.selFocusAtStart;
-
     setSelection(selection);
   }