Bug 228760 [Markers] Column orientation not stored when markers views are closed
If we re-order view columns by drag and drop or add/remove them using the preferences the values we ended up with are not restored on restart.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
* Select all of the elements in the receiver.
	 */
	void selectAll() {
		viewer.getTree().selectAll();
	}
	/**
	 * Set the category group for the receiver.
	 * 
	 * @param group
	 */
	void setCategoryGroup(MarkerGroup group) {
		getCategoriesToExpand().clear();
		builder.setCategoryGroup(group);
	}
	/**
	 * Set the content generator for the receiver.
	 * 
	 * @param generator
	 */
	void setContentGenerator(MarkerContentGenerator generator) {
		viewer.setSelection(new StructuredSelection());
		viewer.removeAndClearAll();
		builder.setGenerator(generator);
		createColumns(viewer.getTree().getColumns());
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.WorkbenchPart#setFocus()
	 */