Only updating the header if valid bounds are generated.

package com.android.systemui.recents;

import static android.app.ActivityManager.StackId.FREEFORM_WORKSPACE_STACK_ID;

import static android.view.View.MeasureSpec;

import android.app.ActivityManager;

import android.app.ActivityOptions;

import android.util.MutableBoolean;

import android.view.AppTransitionAnimationSpec;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewConfiguration;

import com.android.internal.logging.MetricsLogger;

            mDummyStackView.setTasks(stack, false /* allowNotifyStackChanges */);

            Rect taskViewBounds = stackLayout.getUntransformedTaskViewBounds();

            if (!taskViewBounds.isEmpty()) {

                int taskViewWidth = taskViewBounds.width();

                synchronized (mHeaderBarLock) {

                    if (mHeaderBar.getMeasuredWidth() != taskViewWidth ||

                            mHeaderBar.getMeasuredHeight() != mTaskBarHeight) {

                        mHeaderBar.measure(

                        View.MeasureSpec.makeMeasureSpec(taskViewWidth, View.MeasureSpec.EXACTLY),

                        View.MeasureSpec.makeMeasureSpec(mTaskBarHeight, View.MeasureSpec.EXACTLY));

                                MeasureSpec.makeMeasureSpec(taskViewWidth, MeasureSpec.EXACTLY),

                                MeasureSpec.makeMeasureSpec(mTaskBarHeight, MeasureSpec.EXACTLY));

                    }

                    mHeaderBar.layout(0, 0, taskViewWidth, mTaskBarHeight);

                }

                }

            }

        }

    }

    /**

     * Given the stable insets and the rect for our window, calculates the insets that affect our