Private _changedPrivate _columnPrivate _gridPrivate _loopingPrivate _queryPrivate _rowA signal fired when the grid changes.
Private _wrapReturns a cellrenderer config function to render each cell background. If cell match, background is matchBackgroundColor, if it's the current match, background is currentMatchBackgroundColor.
incrementally look for searchText.
Search service remembers the search state and the location of the last match, for incremental searching. Search service is also responsible of providing a cell renderer function to set the background color of cells matching the search text.