Fix UI bugs for widget picker search.

- Mirror search icon in RTL (b/184162989)
- Fix spacing between edit text and cancel button, to make it consistent
with space between search icon and edit text. (b/183602001)
- Scroll to top on every search result. (b/183602001)
- Fix keyboard overlap on orientation change. This is fixed by clearing
text on edit text differently (b/184048899)

Test: Manually tested
Bug: 184162989
Bug: 183602001
Bug: 184048899
Change-Id: I72ed51e1968a55a3105bd8b389d1bbd74d50d8af

res/drawable/ic_allapps_search.xml

@@ -17,7 +17,8 @@
     android:width="24dp"
     android:height="24dp"
     android:viewportHeight="24.0"
-    android:viewportWidth="24.0">
+    android:viewportWidth="24.0"
+    android:autoMirrored="true">
     <path
         android:fillColor="?android:attr/textColorTertiary"
         android:pathData="M15.5,14h-0.79l-0.28,-0.27C15.41,12.59 16,11.11 16,9.5 16,5.91 13.09,3 9.5,3S3,5.91 3,9.5 5.91,16 9.5,16c1.61,0 3.09,-0.59 4.23,-1.57l0.27,0.28v0.79l5,4.99L20.49,19l-4.99,-5zM9.5,14C7.01,14 5,11.99 5,9.5S7.01,5 9.5,5 14,7.01 14,9.5 11.99,14 9.5,14z" />

res/layout/widgets_search_bar.xml

@@ -13,7 +13,9 @@
         android:id="@+id/widgets_search_bar_edit_text"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:padding="12dp"
+        android:paddingVertical="12dp"
+        android:paddingStart="12dp"
+        android:paddingEnd="0dp"
         android:drawablePadding="8dp"
         android:drawableStart="@drawable/ic_allapps_search"
         android:background="@null"
@@ -21,6 +23,7 @@
         android:maxLines="1"
         android:layout_weight="1"
         android:inputType="text"
+        android:imeOptions="actionSearch"
         android:textColor="?android:attr/textColorSecondary"
         android:textColorHint="?android:attr/textColorTertiary"/>
 
@@ -28,7 +31,9 @@
         android:id="@+id/widgets_search_cancel_button"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
-        android:padding="8dp"
+        android:paddingVertical="12dp"
+        android:paddingStart="8dp"
+        android:paddingEnd="12dp"
         android:src="@drawable/ic_gm_close_24"
         android:background="?android:selectableItemBackground"
         android:layout_gravity="center"

src/com/android/launcher3/widget/picker/WidgetsFullSheet.java

@@ -392,6 +392,7 @@ public class WidgetsFullSheet extends BaseWidgetSheet
         mAdapters.get(AdapterHolder.SEARCH).mWidgetsListAdapter.setWidgetsOnSearch(entries);
         updateNoSearchResultsView(
                 mAdapters.get(AdapterHolder.SEARCH).mWidgetsListAdapter.getItemCount() == 0);
+        mAdapters.get(AdapterHolder.SEARCH).mWidgetsRecyclerView.scrollToTop();
     }
 
     private void setViewVisibilityBasedOnSearch(boolean isInSearchMode) {

src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java

@@ -243,4 +243,19 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
          */
         int getHeaderViewHeight();
     }
+
+    @Override
+    public void scrollToTop() {
+        if (mScrollbar != null) {
+            mScrollbar.reattachThumbToScroll();
+        }
+
+        if (getLayoutManager() instanceof LinearLayoutManager) {
+            if (getCurrentScrollY() == 0) {
+                // We are at the top, so don't scrollToPosition (would cause unnecessary relayout).
+                return;
+            }
+        }
+        scrollToPosition(0);
+    }
 }

src/com/android/launcher3/widget/picker/search/WidgetsSearchBarController.java

@@ -102,7 +102,7 @@ public class WidgetsSearchBarController implements TextWatcher,
     @Override
     public void clearSearchResult() {
         mSearchAlgorithm.cancel(/* interruptActiveRequests= */ true);
-        mInput.getText().clear();
+        mInput.setText("");
         clearFocus();
         mSearchModeListener.exitSearchMode();
     }