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 Composite createMarkersTabContent(Composite folder) {
		
		GridLayout layout= new GridLayout();
		layout.marginHeight= 0;
		layout.marginWidth= 0;
		layout.numColumns= 2;
		
		Composite markersComposite= new Composite(folder, SWT.NULL);
		markersComposite.setLayout(layout);
		
		fTodoTasksList.doFillIntoGrid(markersComposite, 3);
		LayoutUtil.setHorizontalSpan(fTodoTasksList.getLabelControl(null), 2);
		
		GridData data= (GridData)fTodoTasksList.getListControl(null).getLayoutData();
		data.grabExcessHorizontalSpace= true;
		data.grabExcessVerticalSpace= true;
		data.verticalAlignment= GridData.FILL;
		
		
		fCaseSensitiveField.doFillIntoGrid(markersComposite, 2);
		return markersComposite;
	}
	protected void validateSettings(String changedKey, String newValue) {
		if (changedKey != null) {
			if (PREF_COMPILER_TASK_TAGS.equals(changedKey)) {
				fTaskTagsStatus= validateTaskTags();
			} else {
				return;
			}
		} else {