Bug 55497 [syntax highlighting] Support case-insensitive Task Tags in JavaCommentScanner
Following a JDT/Core change. Preference pages already support it.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/TodoTaskConfigurationBlock.java
private boolean canEdit(ListDialogField field) {
			return field.getSelectedElements().size() == 1;
		}
		public void customButtonPressed(ListDialogField field, int index) {
			doTodoButtonPressed(index);
		}
		public void selectionChanged(ListDialogField field) {
			field.enableButton(IDX_EDIT, canEdit(field));
		}
			
		public void doubleClicked(ListDialogField field) {
			if (canEdit(field)) {
				doTodoButtonPressed(IDX_EDIT);
			}
		}
		public void dialogFieldChanged(DialogField field) {
			validateSettings(PREF_COMPILER_TASK_TAGS, null);
		}			
		
	}
		
	protected Control createContents(Composite parent) {
		setShell(parent.getShell());
		
		Composite markersComposite= createMarkersTabContent(parent);
		
		validateSettings(null, null);
	
		return markersComposite;
	}