Bug 115711 [content assist] Parameter hints disappear immediately
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/ParameterGuessingProposal.java
}
				model.forceInstall();
				JavaEditor editor= getJavaEditor();
				if (editor != null) {
					model.addLinkingListener(new EditorHighlightingSynchronizer(editor));
				}
				LinkedModeUI ui= new EditorLinkedModeUI(model, getTextViewer());
				ui.setExitPosition(getTextViewer(), baseOffset + replacement.length(), 0, Integer.MAX_VALUE);
				ui.setExitPolicy(new ExitPolicy(')', document));
				ui.setCyclingMode(LinkedModeUI.CYCLE_WHEN_NO_PARENT);
				ui.setDoContextInfo(true);
				ui.enter();
				fSelectedRegion= ui.getSelectedRegion();
			} else {
				fSelectedRegion= new Region(baseOffset + replacement.length(), 0);
			}
		} catch (BadLocationException e) {
			ensurePositionCategoryRemoved(document);
			JavaPlugin.log(e);
			openErrorDialog(e);
		} catch (BadPositionCategoryException e) {
			ensurePositionCategoryRemoved(document);
			JavaPlugin.log(e);
			openErrorDialog(e);
		}
	}
	
	/*
	 * @see org.eclipse.jdt.internal.ui.text.java.JavaMethodCompletionProposal#needsLinkedMode()
	 */