Allow stacks to be placed outside of display

When dismissing the docked stack, we animate the divider to position
-12dp, so the full-screen stack is exactly full-screen when the dismiss
animation is done. Previously, this was prevented by window manager.
Allow it to fix the animation.

Change-Id: Iee4505023dc3f6907d56851965b156235f9f97f2

packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java

@@ -317,6 +317,18 @@ public class DividerView extends FrameLayout implements OnTouchListener,
                 outRect.top = position + mDividerWindowWidth - 2 * mDividerInsets;
                 break;
         }
+        if (outRect.left > outRect.right) {
+            outRect.left = outRect.right;
+        }
+        if (outRect.top > outRect.bottom) {
+            outRect.top = outRect.bottom;
+        }
+        if (outRect.right < outRect.left) {
+            outRect.right = outRect.left;
+        }
+        if (outRect.bottom < outRect.top) {
+            outRect.bottom = outRect.top;
+        }
     }
 
     public void resizeStack(int position) {

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

@@ -190,14 +190,6 @@ class Task implements DimLayer.DimLayerUser {
                 bounds = mTmpRect;
                 mFullscreen = true;
             } else {
-                if ((mStack.mStackId != FREEFORM_WORKSPACE_STACK_ID
-                        && mStack.mStackId != PINNED_STACK_ID) || bounds.isEmpty()) {
-                    // ensure bounds are entirely within the display rect
-                    if (!bounds.intersect(mTmpRect)) {
-                        // Can't set bounds outside the containing display...Sorry!
-                        return BOUNDS_CHANGE_NONE;
-                    }
-                }
                 mFullscreen = mTmpRect.equals(bounds);
             }
         }

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

@@ -143,11 +143,6 @@ public class TaskStack implements DimLayer.DimLayerUser {
                 bounds = mTmpRect;
                 mFullscreen = true;
             } else {
-                // ensure bounds are entirely within the display rect
-                if (!bounds.intersect(mTmpRect)) {
-                    // Can't set bounds outside the containing display.. Sorry!
-                    return false;
-                }
                 mFullscreen = mTmpRect.equals(bounds);
             }
         }