Fix a bug with the slipping lines in the grid with frozen columns

[isqad88]

When you use the grid with frozen columns carry the words in the cells, you may show upwhen scrolling bug when part ofthe frozen columns of slippeddown relative to the normal grid.
I found away to correct this phenomenon in version 4.0.7.

/**
* Css style
*/
.hack-scroll table.x-grid-table { 
  margin-bottom: 18px !important;
}
/**
* word-wrap
*/
.x-column-header-inner .x-column-header-text, .x-grid-cell-inner {    
  white-space: pre-wrap !important;
} 

//at grid with locked columns, and word-wrap at cell
//...
listeners: {         
  afterrender: function(cmp){                              
    cmp.normalGrid.on('scrollershow', function(scroller, orientation) {                         if (orientation == 'vertical')  { 
    cmp.lockedGrid.addCls('hack-scroll');                        
}                    
});                    
    cmp.normalGrid.on('scrollerhide', function(scroller, orientation) {                            if(orientation == 'vertical') { 
    cmp.lockedGrid.removeCls('hack-scroll');                     
}                    
});
}
}
//... 

[mitchellsimoens]

Moved to Ext JS 4 forum.