Bug 53299 Synchronizing 5 projects is locking too much
Build 20040219 While synchronizing 5 projects, I started editing one file in project no.1, while no.3 was being synchronized (1 was long done). I still got locked on validate edit, though the project 1 should have been released from the sync rsc lock. (I did check that no other competing job was getting in the way)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/filebuffers/CompilationUnitDocumentProvider2.java
fCurrentlyOverlaid.addAll(fPreviouslyOverlaid);
				} else if (fPreviouslyOverlaid != null) {
					Iterator e= fPreviouslyOverlaid.iterator();
					while (e.hasNext()) {
						JavaMarkerAnnotation annotation= (JavaMarkerAnnotation) e.next();
						annotation.setOverlay(null);
					}
				}			
			}
			
			/**
			 * Overlays value with problem annotation.
			 * @param problemAnnotation
			 */
			private void setOverlay(Object value, ProblemAnnotation problemAnnotation) {
				if (value instanceof  JavaMarkerAnnotation) {
					JavaMarkerAnnotation annotation= (JavaMarkerAnnotation) value;
					if (annotation.isProblem()) {
						annotation.setOverlay(problemAnnotation);
						fPreviouslyOverlaid.remove(annotation);
						fCurrentlyOverlaid.add(annotation);
					}
				} else {
				}
			}
			
			private void  overlayMarkers(Position position, ProblemAnnotation problemAnnotation) {
				Object value= getAnnotations(position);
				if (value instanceof List) {
					List list= (List) value;