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
if (builder.getPrimarySortField().equals(markerField))
				updateDirectionIndicator(column.getColumn(), markerField);
			
			int columnWidth = markerField.getDefaultColumnWidth(tree);
			if (i == 0) {
				
				GC gc = new GC(tree);
				gc.setFont(tree.getFont());
				FontMetrics fontMetrics = gc.getFontMetrics();
				gc.dispose();
				columnWidth = Math.max(columnWidth, fontMetrics
						.getAverageCharWidth() * 5);
			}
			if (columnWidths != null) {
				Integer value = columnWidths.getInteger(getFieldId(column
						.getColumn()));
				if (value != null)
					columnWidth = value.intValue();
			}
			layout.addColumnData(new ColumnPixelData(columnWidth, true, true));
		}
		
		if (currentColumns.length > fields.length) {
			for (int i = fields.length; i < currentColumns.length; i++) {
				currentColumns[i].dispose();
			}
		}
		viewer.getTree().setLayout(layout);
		tree.setLinesVisible(true);
		tree.setHeaderVisible(true);