Improve 'Replace All' performance.

For Large Java file 'Replace All' takes long time and freezes the UI.
One of the reason is Projection Model tries to iterate over all the
Projection Annotations to expand/collapse status.
We can improve this situation by using Region specific iterator. This
returns annotations which are enclosed by given offset.
This improves the performance by 25% at least.

See eclipse-platform#2257

bundles/org.eclipse.jface.text/projection/org/eclipse/jface/text/source/projection/ProjectionAnnotationModel.java

@@ -149,7 +149,7 @@ protected boolean expandAll(int offset, int length, boolean fireModelChanged) {
 
 		boolean expanding= false;
 
-		Iterator<Annotation> iterator= getAnnotationIterator();
+		Iterator<Annotation> iterator= getAnnotationIterator(offset, length, true, true);
 		while (iterator.hasNext()) {
 			ProjectionAnnotation annotation= (ProjectionAnnotation) iterator.next();
 			if (annotation.isCollapsed()) {