Bug 53122 [Actions] Rebuild Project does not auto-save files
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/BuildAction.java
/**
     * The id of an incremental build action.
     */
    public static final String ID_BUILD = PlatformUI.PLUGIN_ID + ".BuildAction";
    /**
     * The id of a rebuild all action.
     */
    public static final String ID_REBUILD_ALL = PlatformUI.PLUGIN_ID
            + ".RebuildAllAction";
    private int buildType;
    /**
     * The list of IProjects to build (computed lazily).
     */
    private List projectsToBuild = null;
    /**