Bug 206489 [Markers] Tasks column too small in the new markers view
Tasks column too small in the new markers view. We need to take into account the twistie.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/ExtendedMarkersView.java
viewer.setSelection(new StructuredSelection());
		builder.setGenerator(generator);
		createColumns(viewer.getTree().getColumns());
		setPartName(generator.getName());
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.WorkbenchPart#setFocus()
	 */
	public void setFocus() {
		
	}
	/**
	 * Add group to the enabled filters.
	 * 
	 * @param group
	 */
	public void toggleFilter(MarkerFieldFilterGroup group) {
		builder.toggleFilter(group);
	}
	/**
	 * Update the direction indicator as column is now the primary column.
	 * 
	 * @param column
	 * @field {@link MarkerField}
	 */
	void updateDirectionIndicator(TreeColumn column, MarkerField field) {
		viewer.getTree().setSortColumn(column);
		if (builder.getGenerator().getSortDirection(field) == MarkerComparator.ASCENDING)