Fixing widgets get deteled because of double bind

If the AppWidgetHost starts listening in the middle of bind, it rebinds
the old widgets before a new widget is bound, leading to double bind.
We should clear all pending binds, before starting a rebind. As an
extra check only rebind a view which is attached to the screen.

Bug: 73814840
Change-Id: Ie3af683dc4095b158547e700d11e4faf7999466f

src/com/android/launcher3/Launcher.java

@@ -2239,6 +2239,7 @@ public class Launcher extends BaseActivity
         // Clear the workspace because it's going to be rebound
         mWorkspace.clearDropTargets();
         mWorkspace.removeAllWorkspaceScreens();
+        mAppWidgetHost.clearViews();
 
         if (mHotseat != null) {
             mHotseat.resetLayout();

src/com/android/launcher3/LauncherAppWidgetHost.java

@@ -236,7 +236,7 @@ public class LauncherAppWidgetHost extends AppWidgetHost {
     }
 
     @Override
-    protected void clearViews() {
+    public void clearViews() {
         super.clearViews();
         mViews.clear();
     }

src/com/android/launcher3/widget/LauncherAppWidgetHostView.java

@@ -488,13 +488,14 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView
         // Only reinflate when the final configuration is same as the required configuration
         if (mReinflateOnConfigChange && isSameOrientation()) {
             mReinflateOnConfigChange = false;
-            if (isAttachedToWindow()) {
-                reInflate();
-            }
+            reInflate();
         }
     }
 
     public void reInflate() {
+        if (!isAttachedToWindow()) {
+            return;
+        }
         LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) getTag();
         // Remove and rebind the current widget (which was inflated in the wrong
         // orientation), but don't delete it from the database