grid is corrupted on keypress in filter box

[andymartin]

Using the following grid configuration, when I press any key in the filter box -- including tab and backspace -- even when the box is empty -- causes the visible grid rows to change. Expected behavior: rows should only change when filter is modified.

var historyColumnModel = [
	{
		title: "Timestamp", dataIndx: "Timestamp", dataType: "date", editable: false, width: "80",
	},
	{
		title: "User Name", dataIndx: "UserName", editable: false, 
		filter: { type: 'textbox', condition: 'contain', listeners: ['keyup'] },
	},
	{
		title: "Machine Name", dataIndx: "MachineName", editable: false,
		filter: { type: "textbox", condition: 'contain', listeners: ['keyup'] }
	},
	{
		title: "Type Name", dataIndx: "TypeName", editable: false,
		filter: { type: "textbox", condition: 'contain', listeners: ['keyup'] }
	},
	{
		title: "Property Name", dataIndx: "PropertyName", editable: false,
		filter: { type: "textbox", condition: 'contain', listeners: ['keyup'] }
	},
	{
		title: "Sample Count", dataIndx: "Count", editable: false
	}
];

function configurePropertyHistoryPqGrid(data) {
	var obj = {
		colModel: historyColumnModel,
		dataModel: {
			location: "local",
			sorting: "local",
			data: data,
			sortIndx: ["Timestamp"],
			sortDir: ["down"],
			editable: false
		},
		minWidth: 600,
		height: 400,
		scrollModel: { autoFit: true },
		selectionModel: { type: '' },
		filterModel: { on: true, mode: "AND", header: true },
		resizable: true,
		columnBorders: true,
		pageModel: { type: "local", rPP: 20, strRpp: "{0}", strDisplay: "{0} to {1} of {2}" }
	};

	var historyGrid = $("#property-history-grid").pqGrid(obj);
	var grid = historyGrid.pqGrid("getInstance").grid;
	grid.refreshDataAndView();
	grid.hideLoading();
}