Ignore cropping taskbar for top app in split portrait

* See ag/20470413

Bug: 219411750
Test: Swipe up w/ stashed taskbar in portrait.
Thumbnail cutout doesn't appear when dragging to
fullscreen

Change-Id: I5f8279a3d7a1cfe14c6fafaa15307d258a6f2f10

packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/PreviewPositionHelper.java

@@ -39,6 +39,7 @@ public class PreviewPositionHelper {
     private boolean mIsOrientationChanged;
     private SplitBounds mSplitBounds;
     private int mDesiredStagePosition;
+    private boolean mTaskbarInApp;
 
     public Matrix getMatrix() {
         return mMatrix;
@@ -57,6 +58,10 @@ public class PreviewPositionHelper {
         mDesiredStagePosition = desiredStagePosition;
     }
 
+    public void setTaskbarInApp(boolean taskbarInApp) {
+        mTaskbarInApp = taskbarInApp;
+    }
+
     /**
      * Updates the matrix based on the provided parameters
      */
@@ -83,8 +88,18 @@ public class PreviewPositionHelper {
                         ? mSplitBounds.topTaskPercent
                         : (1 - (mSplitBounds.topTaskPercent + mSplitBounds.dividerHeightPercent));
                 // Scale portrait height to that of (actual screen - taskbar inset)
-                fullscreenTaskHeight = (screenHeightPx - taskbarSize) * taskPercent;
-                canvasScreenRatio = canvasHeight / fullscreenTaskHeight;
+                fullscreenTaskHeight = (screenHeightPx) * taskPercent;
+                if (mTaskbarInApp) {
+                    canvasScreenRatio = canvasHeight / fullscreenTaskHeight;
+                } else {
+                    if (mDesiredStagePosition == STAGE_POSITION_TOP_OR_LEFT) {
+                        // Top app isn't cropped at all by taskbar
+                        canvasScreenRatio = 0;
+                    } else {
+                        // Same as fullscreen ratio
+                        canvasScreenRatio = (float) canvasWidth / screenWidthPx;
+                    }
+                }
             } else {
                 // For landscape, scale the width
                 taskPercent = mDesiredStagePosition == STAGE_POSITION_TOP_OR_LEFT