Fix a few issues with occluded Keyguard

- When we get a collapse before the layout happened in SystemUI,
don't expand the panel after the layout.
- Don't reset waitingToShow when coming out of sleep. This will cause
win.isVisibleOrBehindKeyguardLw to return false and then occluded
state will change rapidly from true -> false -> true, leading to
flickering in SysUI.

Bug: 23898941
Change-Id: I2b941188de777086bb2b477f5bfc00cc0cd6abe0

packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelView.java

@@ -883,6 +883,10 @@ public abstract class PanelView extends FrameLayout {
                 new ViewTreeObserver.OnGlobalLayoutListener() {
                     @Override
                     public void onGlobalLayout() {
+                        if (!mInstantExpanding) {
+                            getViewTreeObserver().removeOnGlobalLayoutListener(this);
+                            return;
+                        }
                         if (mStatusBar.getStatusBarWindow().getHeight()
                                 != mStatusBar.getStatusBarHeight()) {
                             getViewTreeObserver().removeOnGlobalLayoutListener(this);
@@ -907,6 +911,10 @@ public abstract class PanelView extends FrameLayout {
         if (mExpanding) {
             notifyExpandingFinished();
         }
+        if (mInstantExpanding) {
+            mInstantExpanding = false;
+            notifyBarPanelExpansionChanged();
+        }
     }
 
     private void abortAnimations() {

services/core/java/com/android/server/wm/WindowManagerService.java

@@ -4409,7 +4409,11 @@ public class WindowManagerService extends IWindowManager.Stub
                 if (wtoken.hidden || wtoken.mAppStopped) {
                     wtoken.allDrawn = false;
                     wtoken.deferClearAllDrawn = false;
-                    wtoken.waitingToShow = true;
+
+                    // If the app was already visible, don't reset the waitingToShow state.
+                    if (wtoken.hidden) {
+                        wtoken.waitingToShow = true;
+                    }
 
                     if (wtoken.clientHidden) {
                         // In the case where we are making an app visible