Limit starting bounds of swipe to animation start rect

* If the starting point is greater than that of the current
device's width (in either positive or negative direction),
reset the starting rect to be fullscreen task bounds
* More details at b/228829958#comment12

Fixes: 228829958
Test: Reboot device and swipe up from home immediately,
app doesn't fling from the side.
Tested with portrait and landscape launcher.
Tested with fake landscape launcher.

Change-Id: I6ea24e30e9de5716b7830f487b2ed63f56598c50

src/com/android/launcher3/touch/PortraitPagedViewHandler.java

@@ -101,6 +101,15 @@ public class PortraitPagedViewHandler implements PagedOrientationHandler {
         //no-op
     }
 
+    @Override
+    public void fixBoundsForHomeAnimStartRect(RectF outStartRect, DeviceProfile deviceProfile) {
+        if (outStartRect.left > deviceProfile.widthPx) {
+            outStartRect.offsetTo(0, outStartRect.top);
+        } else if (outStartRect.left < -deviceProfile.widthPx) {
+            outStartRect.offsetTo(0, outStartRect.top);
+        }
+    }
+
     @Override
     public <T> void setPrimary(T target, Int2DAction<T> action, int param) {
         action.call(target, param, 0);