Remove VirtualizedList disableVirtualization prop

# Conflicts:
#	packages/react-native/ReactNativeApi.d.ts

# Conflicts:
#	packages/react-native/ReactNativeApi.d.ts

Author: zoontek

packages/react-native/ReactNativeApi.d.ts

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<67eb674c33870c82986054f0cee48385>>
+ * @generated SignedSource<<4994d05da642e8549ab401d357454b18>>
  *
  * This file was generated by scripts/js-api/build-types/index.js.
  */
@@ -3413,7 +3413,6 @@ declare type OptionalSectionListProps<ItemT, SectionT = DefaultSectionT> = {
 declare type OptionalVirtualizedListProps = {
   CellRendererComponent?: React.ComponentType<CellRendererProps<Item>>
   debug?: boolean
-  disableVirtualization?: boolean
   extraData?: any
   horizontal?: boolean
   initialNumToRender?: number
@@ -5903,7 +5902,7 @@ export {
   AlertOptions, // a0cdac0f
   AlertType, // 5ab91217
   AndroidKeyboardEvent, // e03becc8
-  Animated, // 91a7b171
+  Animated, // 65d52f22
   AppConfig, // 35c0ca70
   AppRegistry, // 7ef8e53a
   AppState, // 12012be5
@@ -5953,9 +5952,9 @@ export {
   EventSubscription, // b8d084aa
   ExtendedExceptionData, // 5a6ccf5a
   FilterFunction, // bf24c0e3
-  FlatList, // 0f2531c9
-  FlatListInstance, // f31d4744
-  FlatListProps, // b8b5adf2
+  FlatList, // eee316f3
+  FlatListInstance, // feed4943
+  FlatListProps, // 3742895c
   FocusEvent, // 850f1517
   FontVariant, // 7c7558bb
   GestureResponderEvent, // 14d3e77a
@@ -6103,10 +6102,10 @@ export {
   ScrollViewPropsIOS, // da991b9a
   ScrollViewScrollToOptions, // 3313411e
   SectionBase, // dca83594
-  SectionList, // f483c886
+  SectionList, // e667605d
   SectionListData, // e0d79987
-  SectionListInstance, // 1b255509
-  SectionListProps, // e06b9868
+  SectionListInstance, // c08fb0c6
+  SectionListProps, // 4f77470e
   SectionListRenderItem, // 466e3e87
   SectionListRenderItemInfo, // d809238e
   Separators, // 6a45f7e3
@@ -6180,10 +6179,10 @@ export {
   VirtualViewMode, // 6be59722
   VirtualizedList, // 68c7345e
   VirtualizedListInstance, // 423ee7c0
-  VirtualizedListProps, // cc8bc4c9
+  VirtualizedListProps, // b44a5c80
   VirtualizedSectionList, // 9fd9cd61
   VirtualizedSectionListInstance, // 12b706d5
-  VirtualizedSectionListProps, // 12a58a4f
+  VirtualizedSectionListProps, // 400d5db8
   WrapperComponentProvider, // 4b8c7962
   codegenNativeCommands, // 628a7c0a
   codegenNativeComponent, // 32a1bca6

packages/rn-tester/js/examples/FlatList/FlatList-basic.js

@@ -64,7 +64,6 @@ type State = {
   filterText: string,
   fixedHeight: boolean,
   logViewable: boolean,
-  virtualized: boolean,
   empty: boolean,
   useFlatListItemComponent: boolean,
   fadingEdgeLength: number,
@@ -89,7 +88,6 @@ class FlatListExample extends React.PureComponent<Props, State> {
     filterText: '',
     fixedHeight: true,
     logViewable: false,
-    virtualized: true,
     empty: false,
     useFlatListItemComponent: false,
     fadingEdgeLength: 0,
@@ -166,11 +164,6 @@ class FlatListExample extends React.PureComponent<Props, State> {
               />
             </View>
             <View style={styles.options}>
-              {renderSmallSwitchOption(
-                'Virtualized',
-                this.state.virtualized,
-                this._setBooleanValue('virtualized'),
-              )}
               {renderSmallSwitchOption(
                 'Horizontal',
                 this.state.horizontal,
@@ -260,7 +253,6 @@ class FlatListExample extends React.PureComponent<Props, State> {
             // $FlowFixMe[missing-empty-array-annot]
             data={this.state.empty ? [] : filteredData}
             debug={this.state.debug}
-            disableVirtualization={!this.state.virtualized}
             getItemLayout={
               this.state.fixedHeight ? this._getItemLayout : undefined
             }

packages/rn-tester/js/examples/FlatList/FlatList-multiColumn.js

@@ -37,7 +37,6 @@ component MultiColumnExample() {
   const [fixedHeight, setFixedHeight] = useState(true);
   const [logViewable, setLogViewable] = useState(false);
   const [numColumns, setNumColumns] = useState(2);
-  const [virtualized, setVirtualized] = useState(true);
 
   const _onChangeFilterText = (_filterText: string) => {
     setFilterText(_filterText);
@@ -48,9 +47,6 @@ component MultiColumnExample() {
 
   const _setBooleanValue = (key: string) => (value: boolean) => {
     switch (key) {
-      case 'virtualized':
-        setVirtualized(value);
-        break;
       case 'fixedHeight':
         setFixedHeight(value);
         break;
@@ -138,11 +134,6 @@ component MultiColumnExample() {
           />
         </View>
         <View style={styles.row}>
-          {renderSmallSwitchOption(
-            'Virtualized',
-            virtualized,
-            _setBooleanValue('virtualized'),
-          )}
           {renderSmallSwitchOption(
             'Fixed Height',
             fixedHeight,
@@ -168,7 +159,6 @@ component MultiColumnExample() {
         }
         refreshing={false}
         renderItem={_renderItemComponent}
-        disableVirtualization={virtualized}
         onViewableItemsChanged={_onViewableItemsChanged}
       />
     </RNTesterPage>

packages/rn-tester/js/examples/SectionList/SectionList-scrollable.js

@@ -179,7 +179,6 @@ export component SectionList_scrollable() {
     {useNativeDriver: true},
   );
   const [filterText, setFilterText] = useState('');
-  const [virtualized, setVirtualized] = useState(true);
   const [logViewable, setLogViewable] = useState(false);
   const [debug, setDebug] = useState(false);
   const [inverted, setInverted] = useState(false);
@@ -253,7 +252,6 @@ export component SectionList_scrollable() {
           value={filterText}
         />
         <View style={styles.optionSection}>
-          {renderSmallSwitchOption('Virtualized', virtualized, setVirtualized)}
           {renderSmallSwitchOption('Log Viewable', logViewable, setLogViewable)}
           {renderSmallSwitchOption('Debug', debug, setDebug)}
           {renderSmallSwitchOption('Inverted', inverted, setInverted)}
@@ -299,7 +297,6 @@ export component SectionList_scrollable() {
         accessibilityRole="list"
         debug={debug}
         inverted={inverted}
-        disableVirtualization={!virtualized}
         onRefresh={() => Alert.alert('onRefresh: nothing to refresh :P')}
         onScroll={scrollSinkY}
         onViewableItemsChanged={onViewableItemsChanged}

packages/virtualized-lists/Lists/VirtualizedList.d.ts

@@ -210,13 +210,6 @@ export interface VirtualizedListWithoutRenderItemProps<ItemT>
    */
   debug?: boolean | undefined;
 
-  /**
-   * DEPRECATED: Virtualization provides significant performance and memory optimizations, but fully
-   * unmounts react instances that are outside of the render window. You should only need to disable
-   * this for debugging purposes.
-   */
-  disableVirtualization?: boolean | undefined;
-
   /**
    * A marker property for telling the list to re-render (since it implements `PureComponent`). If
    * any of your `renderItem`, Header, Footer, etc. functions depend on anything outside of the

packages/virtualized-lists/Lists/VirtualizedList.js

@@ -609,12 +609,8 @@ class VirtualizedList extends StateSafePureComponent<
     pendingScrollUpdateCount: number,
   ): {first: number, last: number} {
     const {data, getItemCount} = props;
-    const onEndReachedThreshold = onEndReachedThresholdOrDefault(
-      props.onEndReachedThreshold,
-    );
-    const {offset, visibleLength} = this._scrollMetrics;
+    const {visibleLength} = this._scrollMetrics;
     const contentLength = this._listMetrics.getContentLength();
-    const distanceFromEnd = contentLength - visibleLength - offset;
 
     // Wait until the scroll view metrics have been set up. And until then,
     // we will trust the initialNumToRender suggestion
@@ -624,43 +620,27 @@ class VirtualizedList extends StateSafePureComponent<
         : cellsAroundViewport;
     }
 
-    let newCellsAroundViewport: {first: number, last: number};
-    if (props.disableVirtualization) {
-      const renderAhead =
-        distanceFromEnd < onEndReachedThreshold * visibleLength
-          ? maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch)
-          : 0;
-
-      newCellsAroundViewport = {
-        first: 0,
-        last: Math.min(
-          cellsAroundViewport.last + renderAhead,
-          getItemCount(data) - 1,
-        ),
-      };
-    } else {
-      // If we have a pending scroll update, we should not adjust the render window as it
-      // might override the correct window.
-      if (pendingScrollUpdateCount > 0) {
-        return cellsAroundViewport.last >= getItemCount(data)
-          ? VirtualizedList._constrainToItemCount(cellsAroundViewport, props)
-          : cellsAroundViewport;
-      }
-
-      newCellsAroundViewport = computeWindowedRenderLimits(
-        props,
-        maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch),
-        windowSizeOrDefault(props.windowSize),
-        cellsAroundViewport,
-        this._listMetrics,
-        this._scrollMetrics,
-      );
-      invariant(
-        newCellsAroundViewport.last < getItemCount(data),
-        'computeWindowedRenderLimits() should return range in-bounds',
-      );
+    // If we have a pending scroll update, we should not adjust the render window as it
+    // might override the correct window.
+    if (pendingScrollUpdateCount > 0) {
+      return cellsAroundViewport.last >= getItemCount(data)
+        ? VirtualizedList._constrainToItemCount(cellsAroundViewport, props)
+        : cellsAroundViewport;
     }
 
+    const newCellsAroundViewport = computeWindowedRenderLimits(
+      props,
+      maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch),
+      windowSizeOrDefault(props.windowSize),
+      cellsAroundViewport,
+      this._listMetrics,
+      this._scrollMetrics,
+    );
+    invariant(
+      newCellsAroundViewport.last < getItemCount(data),
+      'computeWindowedRenderLimits() should return range in-bounds',
+    );
+
     if (this._nestedChildLists.size() > 0) {
       // If some cell in the new state has a child list in it, we should only render
       // up through that item, so that we give that list a chance to render.
@@ -1015,12 +995,6 @@ class VirtualizedList extends StateSafePureComponent<
 
       for (const section of renderRegions) {
         if (section.isSpacer) {
-          // Legacy behavior is to avoid spacers when virtualization is
-          // disabled (including head spacers on initial render).
-          if (this.props.disableVirtualization) {
-            continue;
-          }
-
           // Without getItemLayout, we limit our tail spacer to the _highestMeasuredFrameIndex to
           // prevent the user for hyperscrolling into un-measured area because otherwise content will
           // likely jump around as it renders in above the viewport.

packages/virtualized-lists/Lists/VirtualizedListProps.js

@@ -75,12 +75,6 @@ type OptionalVirtualizedListProps = {
    * implementation, but with a significant perf hit.
    */
   debug?: ?boolean,
-  /**
-   * DEPRECATED: Virtualization provides significant performance and memory optimizations, but fully
-   * unmounts react instances that are outside of the render window. You should only need to disable
-   * this for debugging purposes. Defaults to false.
-   */
-  disableVirtualization?: ?boolean,
   /**
    * A marker property for telling the list to re-render (since it implements `PureComponent`). If
    * any of your `renderItem`, Header, Footer, etc. functions depend on anything outside of the