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
/**
	 * Open the selected markers
	 */
	void openSelectedMarkers() {
		IMarker[] markers = getSelectedMarkers();
		for (int i = 0; i < markers.length; i++) {
			IMarker marker = markers[i];
			IWorkbenchPage page = getSite().getPage();
			openMarkerInEditor(marker, page);
		}
	}
	/**
	 * Restore the expanded categories.
	 * 
	 * @param builder
	 */
	void reexpandCategories(final CachedMarkerBuilder builder) {
		if (!getCategoriesToExpand().isEmpty() && builder.isShowingHierarchy()) {
			MarkerItem[] items = builder.getElements();
			for (int i = 0; i < items.length; i++) {
				String name = ((MarkerCategory) items[i]).getName();
				if (getCategoriesToExpand().contains(name))
					viewer.expandToLevel(items[i], 2);
			}
		}
	}
	/**
	 * Register the context menu for the receiver so that commands may be added
	 * to it.
	 */