Description Clemens Schneider 2011-10-06 14:54:46 EDT

Build Identifier: 1.5M2

When using TableViewer in Virtual mode with many items (say 50000+), hovering an arbitrary entry in the table causes all TableItems to be instanciated. Long UI freezes and an increased memory footprint on server side are the result of this misbehaviour.
Following stacktrace shows when the problem occurs. A call to Table.getItems() instanciates all TableItems.

	Table.getItems() line: 769	
	TableLCA.getItemById(Table, String) line: 441	
	TableLCA.readCellToolTipTextRequested(Table) line: 417	
	TableLCA.readData(Widget) line: 92	
	DisplayLCA$1.doVisit(Widget) line: 96	
	DisplayLCA$1(WidgetTreeVisitor$AllWidgetTreeVisitor).visit(Composite) line: 34	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 48	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	WidgetTreeVisitor.accept(Widget, WidgetTreeVisitor) line: 55	
	DisplayLCA.readData(Display) line: 103	
	ReadData.execute(Display) line: 26	
	RWTLifeCycle.continueLifeCycle() line: 183	
	RWTLifeCycle.sleep() line: 259	
	Display.sleep() line: 1174	
	ControlsDemo.createUI() line: 47	
	EntryPointManager.createUI(String) line: 81	
	RWTLifeCycle.createUI() line: 204	
	RWTLifeCycle$UIThreadController.run() line: 88	
	UIThread(Thread).run() line: 679	
	UIThread.run() line: 101	


Reproducible: Always

Steps to Reproduce:
1. Open Controls-Demo-Code and change constant value of ADD_ITEMS to 50000
2. Startup Controls-Demo, TableViewer-Tab, select VIRTUAL, add 50000 items
3. Hover over some arbitrary row
4. UI freezes, all TableItems get instanciated
The issue is more severe on slower browsers (like IE8) but is nevertheless noticeable in chrome and safari (add more items for heavier delay)