Make sure distinct widgets items are used when mapping widget component

names to widget items.

This is to prevent a crash on duplicate key when creating map.

Bug: 204065759
Test: Enabled flag and got no crash
Change-Id: Ice9f93af76c02eeba53c934687358ed806c60b60

quickstep/src/com/android/launcher3/model/WidgetsPredictionUpdateTask.java

@@ -83,7 +83,7 @@ public final class WidgetsPredictionUpdateTask extends BaseModelUpdateTask {
             }
         } else {
             Map<ComponentKey, WidgetItem> widgetItems =
-                    allWidgets.values().stream().flatMap(List::stream)
+                    allWidgets.values().stream().flatMap(List::stream).distinct()
                             .collect(Collectors.toMap(widget -> (ComponentKey) widget,
                                     widget -> widget));
             for (AppTarget app : mTargets) {