Merge "Fix issue #4974633: Block the HOME button using TYPE_KEYGUARD"

            int attrChanges = 0;

            int flagChanges = 0;

            if (attrs != null) {

                if (win.mAttrs.type != attrs.type) {

                    throw new IllegalArgumentException(

                            "Window type can not be changed after the window is added.");

                }

                flagChanges = win.mAttrs.flags ^= attrs.flags;

                attrChanges = win.mAttrs.copyFrom(attrs);

            }