[Multiline] If a multiline searchbox can scroll up, don't scroll all apps container

Bug: b/390540638
Flag: EXEMPT bug fix
Test: Before: http://recall/clips/2c3e5774-c0ba-4a2d-b878-db3a6efec247
Test: After: http://recall/clips/3c98c52b-7f94-4dd4-a6f6-560403d4a426
Change-Id: I9dad962740ec31edad6213c41e2dec04deeedf0b

src/com/android/launcher3/allapps/ActivityAllAppsContainerView.java

@@ -435,10 +435,21 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
 
     public boolean shouldContainerScroll(MotionEvent ev) {
         BaseDragLayer dragLayer = mActivityContext.getDragLayer();
-        // IF the MotionEvent is inside the search box or handle area, and the container keeps on
-        // receiving touch input, container should move down.
-        if (dragLayer.isEventOverView(mSearchContainer, ev)
-                || dragLayer.isEventOverView(mBottomSheetHandleArea, ev)) {
+        // If the MotionEvent is inside the search box, and the container keeps on receiving touch
+        // input, container should move down.
+        if (dragLayer.isEventOverView(mSearchContainer, ev)) {
+            // If the touch was on the edit text, container should move down ONLY when edit text is
+            // already at the top.
+            View editText = mSearchUiManager.getEditText();
+            if (editText != null && dragLayer.isEventOverView(editText, ev)) {
+                boolean canScrollUp = editText.canScrollVertically(-1);
+                return !canScrollUp;
+            }
+            return true;
+        }
+        // If the MotionEvent is inside the handle area, and the container keeps on receiving touch
+        // input, container should move down.
+        if (dragLayer.isEventOverView(mBottomSheetHandleArea, ev)) {
             return true;
         }
         AllAppsRecyclerView rv = getActiveRecyclerView();