Bug 41958 No reaction to F2 after Java Tooltip Hover showed up
200308250800 + export 20030826_1219 Smoke Test: - open TestCase.java - hover over method call "run" in method run(TestResult) - Hover appears and tells to "Press F2 for focus." - Pressing F2 *after* the hover appeared does *not* focus the tooltip description
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
ISelection selection= getSelectionProvider().getSelection();
		if (selection instanceof TextSelection) {
			TextSelection textSelection= (TextSelection) selection;
			if (textSelection.getOffset() != 0 || textSelection.getLength() != 0)
				markInNavigationHistory();
		}
		
		if (reference != null) {
			
			StyledText  textWidget= null;
			
			ISourceViewer sourceViewer= getSourceViewer();
			if (sourceViewer != null)
				textWidget= sourceViewer.getTextWidget();
			
			if (textWidget == null)
				return;
				
			try {
				
				ISourceRange range= reference.getSourceRange();
				if (range == null)
					return;
				
				int offset= range.getOffset();
				int length= range.getLength();
				
				if (offset < 0 || length < 0)
					return;