Fix issue that widget drag and drop failed when are off

Remove extra screen & go to normal state only if widget
addition was complete. If a config activity was started, then
don't change to remove screen yet or go to normal state. Else,
QuickStepLauncher clears the existing activity open requests when
going to normal state. When animations are off, this led to config activity to never launch and hence, such widgets not being added.

Bug: 369422714
Test: Manual
Flag: EXEMPT BUGFIX
Change-Id: I4e7e29fd998a0cc5ca18a7a48b91a5b788a60a52

src/com/android/launcher3/Launcher.java

@@ -1872,13 +1872,18 @@ public class Launcher extends StatefulActivity<LauncherState>
             }
         }
 
-        // Exit spring loaded mode if necessary after adding the widget
-        Runnable onComplete = MULTI_SELECT_EDIT_MODE.get() ? null
-                : () -> mStateManager.goToState(NORMAL, SPRING_LOADED_EXIT_DELAY);
+        // Exit spring loaded mode if necessary after adding the widget; unless config activity was
+        // started.
+        Runnable onComplete = MULTI_SELECT_EDIT_MODE.get() ? null : () -> mStateManager.goToState(
+                NORMAL, SPRING_LOADED_EXIT_DELAY);
         completeAddAppWidget(appWidgetId, info, boundWidget,
                 addFlowHandler.getProviderInfo(this), addFlowHandler.needsConfigure(),
                 false, widgetPreviewBitmap);
-        mWorkspace.removeExtraEmptyScreenDelayed(delay, false, onComplete);
+        // Remove extra screen if widget drop concluded. If a config activity was started, extra
+        // screen will be removed when we get back its result.
+        if (!isActivityStarted) {
+            mWorkspace.removeExtraEmptyScreenDelayed(delay, false, onComplete);
+        }
     }
 
     public void addPendingItem(PendingAddItemInfo info, int container, int screenId,