Bug 213504 [Markers] Problems View no longer supports dragging into the Editor Area
I20071218-0800. You used to be able to drag an error into the Editor Area in order to open the associated file. I commonly use the DnD gesture to open a 'problem' but it appears that this isn't working in the new version...
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
while (iterator.hasNext()) {
				MarkerSupportItem next = (MarkerSupportItem) iterator.next();
				if (next.isConcrete()) {
					preservedSelection.add(new MarkerSelectionEntry(next));
					getCategoriesToExpand().add(next.getParent());
				} else
					getCategoriesToExpand().add(next);
			}
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.ViewPart#saveState(org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento memento) {
		super.saveState(memento);
		memento.putString(TAG_GENERATOR, builder.getGenerator().getId());
		memento.putString(TAG_PART_NAME, getPartName());
		if (!getCategoriesToExpand().isEmpty()) {
			IMemento expanded = memento.createChild(TAG_EXPANDED);
			Iterator categories = getCategoriesToExpand().iterator();
			while (categories.hasNext()) {
				expanded.createChild(TAG_CATEGORY, (String) categories.next());
			}
		}
		builder.saveState(memento);
		IMemento columnEntry = memento.createChild(TAG_COLUMN_WIDTHS);
		TreeColumn[] columns = viewer.getTree().getColumns();
		for (int i = 0; i < columns.length; i++) {