fix(move-columns): Fix #3448 - The issue is caused by setting a left …

…position to moving element relative to the browser viewport which will not take scroll position into account. By setting left position relative to moving element's parent, the problem will gone.

src/features/move-columns/js/column-movable.js

@@ -436,16 +436,7 @@
                   //Left of cloned element should be aligned to original header cell.
                   movingElm.addClass('movingColumn');
                   var movingElementStyles = {};
-                  var elmLeft;
-                  if (gridUtil.detectBrowser() === 'safari') {
-                    //Correction for Safari getBoundingClientRect,
-                    //which does not correctly compute when there is an horizontal scroll
-                    elmLeft = $elm[0].offsetLeft + $elm[0].offsetWidth - $elm[0].getBoundingClientRect().width;
-                  }
-                  else {
-                    elmLeft = $elm[0].getBoundingClientRect().left;
-                  }
-                  movingElementStyles.left = (elmLeft - gridLeft) + 'px';
+                  movingElementStyles.left = $elm[0].offsetLeft + 'px';
                   var gridRight = $scope.grid.element[0].getBoundingClientRect().right;
                   var elmRight = $elm[0].getBoundingClientRect().right;
                   if (elmRight > gridRight) {
@@ -475,7 +466,8 @@
 
                   //Update css of moving column to adjust to new left value or fire scroll in case column has reached edge of grid
                   if ((currentElmLeft >= gridLeft || changeValue > 0) && (currentElmRight <= rightMoveLimit || changeValue < 0)) {
-                    movingElm.css({visibility: 'visible', 'left': newElementLeft + 'px'});
+                    movingElm.css({visibility: 'visible', 'left': (movingElm[0].offsetLeft + 
+                      (newElementLeft < rightMoveLimit ? changeValue : (rightMoveLimit - currentElmLeft))) + 'px'});
                   }
                   else if (totalColumnWidth > Math.ceil(uiGridCtrl.grid.gridWidth)) {
                     changeValue *= 8;