Bug 89971 [Viewers] Viewers that use IViewerLabelProvider do too many instanceof checks
M6 Checking our viewer the calls to buildLabel are doing too many instanceof checks. As a result certain viewers (such as the table viewer) are twice as slow as they were in 3.0 due to these checks. I have written some performance suites to test the Table, Tree, List and Combo viewers. Table and Tree have this issue.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
}
				} else {
					text = tprov.getColumnText(element, column);
					image = tprov.getColumnImage(element, column);
				}
				
				if (text == null)
					text = ""; 
				treeItem.setText(column, text);
				if (treeItem.getImage(column) != image) {
					treeItem.setImage(column, image);
				}
			}
		}
		colorAndFontCollector.applyFontsAndColors(treeItem);
	}
	/**
	 * Starts editing the given element.
	 * 
	 * @param element
	 *            the element
	 * @param column
	 *            the column number
	 * @since 3.1
	 */
	public void editElement(Object element, int column) {
		treeViewerImpl.editElement(element, column);
	}
	/**
	 * Returns the cell editors of this tree viewer.