Page resets when scrolling slowly fix

Fix: 324071635
Flag: NONE
Test: Verified manually on RTL and non-RTL
Change-Id: Id778a0a01505d30bca4f216322f3ef3b951e63a7
(cherry picked from commit cae498032f)

src/com/android/launcher3/PagedView.java

@@ -826,7 +826,9 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
                 // or right edge for RTL.
                 final int pageScroll =
                         mIsRtl ? childPrimaryEnd - scrollOffsetEnd : childStart - scrollOffsetStart;
-                if (outPageScrolls[i] != pageScroll) {
+                // If there's more than one panel, only update scroll on leftmost panel.
+                if (outPageScrolls[i] != pageScroll
+                        && (panelCount <= 1 || i == getLeftmostVisiblePageForIndex(i))) {
                     pageScrollChanged = true;
                     outPageScrolls[i] = pageScroll;
                 }
@@ -842,7 +844,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
 
         if (panelCount > 1) {
             for (int i = 0; i < childCount; i++) {
-                // In case we have multiple panels, always use left most panel's page scroll for all
+                // In case we have multiple panels, always use leftmost panel's page scroll for all
                 // panels on the screen.
                 int adjustedScroll = outPageScrolls[getLeftmostVisiblePageForIndex(i)];
                 if (outPageScrolls[i] != adjustedScroll) {