Fix issue #5823276: home repaints after full-screen app is exited

Don't consider a window as a candidate for the top fullscreen window
if it is not going to be a candiate for layout.

Also don't consider windows a candidate for layout if their app token
is hidden.  This fixes a transient state where we are preparing to
unhide the window but have not done so yet.

Change-Id: Ife5299ffa003c1df1a4f787b7a2809cbf614ec16
diff --git a/core/java/android/view/WindowManagerPolicy.java b/core/java/android/view/WindowManagerPolicy.java
index 924cb53..8ab468d 100644
--- a/core/java/android/view/WindowManagerPolicy.java
+++ b/core/java/android/view/WindowManagerPolicy.java
@@ -298,6 +298,11 @@
         boolean isDisplayedLw();
 
         /**
+         * Is this window considered to be gone for purposes of layout?
+         */
+        boolean isGoneForLayoutLw();
+
+        /**
          * Returns true if this window has been shown on screen at some time in 
          * the past.  Must be called with the window manager lock held.
          * 
diff --git a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
index 0b223c1..eeade05 100755
--- a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
+++ b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
@@ -2336,7 +2336,7 @@
         if (DEBUG_LAYOUT) Slog.i(TAG, "Win " + win + ": isVisibleOrBehindKeyguardLw="
                 + win.isVisibleOrBehindKeyguardLw());
         if (mTopFullscreenOpaqueWindowState == null &&
-                win.isVisibleOrBehindKeyguardLw()) {
+                win.isVisibleOrBehindKeyguardLw() && !win.isGoneForLayoutLw()) {
             if ((attrs.flags & FLAG_FORCE_NOT_FULLSCREEN) != 0) {
                 mForceStatusBar = true;
             }
@@ -2391,7 +2391,7 @@
                 // case though.
                 if (topIsFullscreen) {
                     if (mStatusBarCanHide) {
-                        if (DEBUG_LAYOUT) Log.v(TAG, "Hiding status bar");
+                        if (DEBUG_LAYOUT) Log.v(TAG, "** HIDING status bar");
                         if (mStatusBar.hideLw(true)) {
                             changes |= FINISH_LAYOUT_REDO_LAYOUT;
 
@@ -2407,7 +2407,7 @@
                         Log.v(TAG, "Preventing status bar from hiding by policy");
                     }
                 } else {
-                    if (DEBUG_LAYOUT) Log.v(TAG, "Showing status bar: top is not fullscreen");
+                    if (DEBUG_LAYOUT) Log.v(TAG, "** SHOWING status bar: top is not fullscreen");
                     if (mStatusBar.showLw(true)) changes |= FINISH_LAYOUT_REDO_LAYOUT;
                 }
             }
diff --git a/services/java/com/android/server/wm/WindowManagerService.java b/services/java/com/android/server/wm/WindowManagerService.java
index f5c2de9..47a7e16 100644
--- a/services/java/com/android/server/wm/WindowManagerService.java
+++ b/services/java/com/android/server/wm/WindowManagerService.java
@@ -7391,8 +7391,11 @@
         final int N = mWindows.size();
         int i;
 
-        if (DEBUG_LAYOUT) Slog.v(TAG, "performLayout: needed="
-                + mLayoutNeeded + " dw=" + dw + " dh=" + dh);
+        if (DEBUG_LAYOUT) {
+            Slog.v(TAG, "-------------------------------------");
+            Slog.v(TAG, "performLayout: needed="
+                    + mLayoutNeeded + " dw=" + dw + " dh=" + dh);
+        }
         
         mPolicy.beginLayoutLw(dw, dh, mRotation);
 
@@ -7409,19 +7412,20 @@
             // Don't do layout of a window if it is not visible, or
             // soon won't be visible, to avoid wasting time and funky
             // changes while a window is animating away.
-            final AppWindowToken atoken = win.mAppToken;
-            final boolean gone = win.mViewVisibility == View.GONE
-                    || !win.mRelayoutCalled
-                    || (atoken == null && win.mRootToken.hidden)
-                    || (atoken != null && atoken.hiddenRequested)
-                    || win.mAttachedHidden
-                    || win.mExiting || win.mDestroying;
+            final boolean gone = win.isGoneForLayoutLw();
 
             if (DEBUG_LAYOUT && !win.mLayoutAttached) {
-                Slog.v(TAG, "First pass " + win
+                Slog.v(TAG, "1ST PASS " + win
                         + ": gone=" + gone + " mHaveFrame=" + win.mHaveFrame
                         + " mLayoutAttached=" + win.mLayoutAttached);
-                if (gone) Slog.v(TAG, "  (mViewVisibility="
+                final AppWindowToken atoken = win.mAppToken;
+                if (gone) Slog.v(TAG, "  GONE: mViewVisibility="
+                        + win.mViewVisibility + " mRelayoutCalled="
+                        + win.mRelayoutCalled + " hidden="
+                        + win.mRootToken.hidden + " hiddenRequested="
+                        + (atoken != null && atoken.hiddenRequested)
+                        + " mAttachedHidden=" + win.mAttachedHidden);
+                else Slog.v(TAG, "  VIS: mViewVisibility="
                         + win.mViewVisibility + " mRelayoutCalled="
                         + win.mRelayoutCalled + " hidden="
                         + win.mRootToken.hidden + " hiddenRequested="
@@ -7443,7 +7447,7 @@
                     win.prelayout();
                     mPolicy.layoutWindowLw(win, win.mAttrs, null);
                     win.mLayoutSeq = seq;
-                    if (DEBUG_LAYOUT) Slog.v(TAG, "-> mFrame="
+                    if (DEBUG_LAYOUT) Slog.v(TAG, "  LAYOUT: mFrame="
                             + win.mFrame + " mContainingFrame="
                             + win.mContainingFrame + " mDisplayFrame="
                             + win.mDisplayFrame);
@@ -7461,7 +7465,7 @@
             WindowState win = mWindows.get(i);
 
             if (win.mLayoutAttached) {
-                if (DEBUG_LAYOUT) Slog.v(TAG, "Second pass " + win
+                if (DEBUG_LAYOUT) Slog.v(TAG, "2ND PASS " + win
                         + " mHaveFrame=" + win.mHaveFrame
                         + " mViewVisibility=" + win.mViewVisibility
                         + " mRelayoutCalled=" + win.mRelayoutCalled);
@@ -7479,7 +7483,7 @@
                     win.prelayout();
                     mPolicy.layoutWindowLw(win, win.mAttrs, win.mAttachedWindow);
                     win.mLayoutSeq = seq;
-                    if (DEBUG_LAYOUT) Slog.v(TAG, "-> mFrame="
+                    if (DEBUG_LAYOUT) Slog.v(TAG, "  LAYOUT: mFrame="
                             + win.mFrame + " mContainingFrame="
                             + win.mContainingFrame + " mDisplayFrame="
                             + win.mDisplayFrame);
diff --git a/services/java/com/android/server/wm/WindowState.java b/services/java/com/android/server/wm/WindowState.java
index 75bda41..794515b 100644
--- a/services/java/com/android/server/wm/WindowState.java
+++ b/services/java/com/android/server/wm/WindowState.java
@@ -1444,6 +1444,16 @@
                     || mAnimating);
     }
 
+    public boolean isGoneForLayoutLw() {
+        final AppWindowToken atoken = mAppToken;
+        return mViewVisibility == View.GONE
+                || !mRelayoutCalled
+                || (atoken == null && mRootToken.hidden)
+                || (atoken != null && (atoken.hiddenRequested || atoken.hidden))
+                || mAttachedHidden
+                || mExiting || mDestroying;
+    }
+
     /**
      * Returns true if the window has a surface that it has drawn a
      * complete UI in to.