rusackas commented on code in PR #39460:
URL: https://github.com/apache/superset/pull/39460#discussion_r3329713099


##########
superset-frontend/src/dashboard/components/SliceAdder.tsx:
##########
@@ -174,295 +164,284 @@ function getFilteredSortedSlices(
     .filter(createFilter(searchTerm, KEYS_TO_FILTERS))
     .sort(sortByComparator(sortBy));
 }
-class SliceAdder extends Component<SliceAdderProps, SliceAdderState> {
-  private slicesRequest?: AbortController | Promise<void>;
-
-  static defaultProps = {
-    selectedSliceIds: [],
-    editMode: false,
-    errorMessage: '',
-  };
-
-  constructor(props: SliceAdderProps) {
-    super(props);
-    this.state = {
-      filteredSlices: [],
-      searchTerm: '',
-      sortBy: DEFAULT_SORT_KEY,
-      selectedSliceIdsSet: new Set(props.selectedSliceIds),
-      showOnlyMyCharts: getItem(
-        LocalStorageKeys.DashboardEditorShowOnlyMyCharts,
-        true,
-      ),
-    };
-    this.rowRenderer = this.rowRenderer.bind(this);
-    this.searchUpdated = this.searchUpdated.bind(this);
-    this.handleSelect = this.handleSelect.bind(this);
-    this.userIdForFetch = this.userIdForFetch.bind(this);
-    this.onShowOnlyMyCharts = this.onShowOnlyMyCharts.bind(this);
-  }
-
-  userIdForFetch() {
-    return this.state.showOnlyMyCharts ? this.props.userId : undefined;
-  }
-
-  componentDidMount() {
-    this.slicesRequest = this.props.fetchSlices(
-      this.userIdForFetch(),
-      '',
-      this.state.sortBy,
-    );
-  }
-
-  componentDidUpdate(prevProps: SliceAdderProps) {
-    const nextState: SliceAdderState = {} as SliceAdderState;
-    if (this.props.lastUpdated !== prevProps.lastUpdated) {
-      nextState.filteredSlices = getFilteredSortedSlices(
-        this.props.slices,
-        this.state.searchTerm,
-        this.state.sortBy,
-        this.state.showOnlyMyCharts,
-        this.props.userId,
-      );
-    }
-
-    if (prevProps.selectedSliceIds !== this.props.selectedSliceIds) {
-      nextState.selectedSliceIdsSet = new Set(this.props.selectedSliceIds);
-    }
-
-    if (Object.keys(nextState).length) {
-      this.setState(nextState);
-    }
-  }
 
-  componentWillUnmount() {
-    // Clears the redux store keeping only selected items
-    const selectedSlices = pickBy(this.props.slices, (value: Slice) =>
-      this.state.selectedSliceIdsSet.has(value.slice_id),
-    );
-
-    this.props.updateSlices(selectedSlices);
-    if (this.slicesRequest instanceof AbortController) {
-      this.slicesRequest.abort();
-    }
-  }
-
-  handleChange = debounce(value => {
-    this.searchUpdated(value);
-    this.slicesRequest = this.props.fetchSlices(
-      this.userIdForFetch(),
-      value,
-      this.state.sortBy,
-    );
-  }, 300);
-
-  searchUpdated(searchTerm: string) {
-    this.setState(prevState => ({
-      searchTerm,
-      filteredSlices: getFilteredSortedSlices(
-        this.props.slices,
+function SliceAdder({
+  fetchSlices,
+  updateSlices,
+  isLoading,
+  slices,
+  errorMessage = '',
+  userId,
+  selectedSliceIds = [],
+  editMode = false,
+  dashboardId,
+}: SliceAdderProps) {
+  const theme = useTheme();
+  const slicesRequestRef = useRef<AbortController | Promise<void>>();
+
+  const [searchTerm, setSearchTerm] = useState('');
+  const [sortBy, setSortBy] = useState<keyof Slice>(DEFAULT_SORT_KEY);
+  const [selectedSliceIdsSet, setSelectedSliceIdsSet] = useState(
+    () => new Set(selectedSliceIds),
+  );
+
+  // Refs to track latest values for cleanup effect
+  const latestSlicesRef = useRef(slices);
+  const latestSelectedSliceIdsSetRef = useRef(selectedSliceIdsSet);
+  const [showOnlyMyCharts, setShowOnlyMyCharts] = useState(() =>
+    getItem(LocalStorageKeys.DashboardEditorShowOnlyMyCharts, true),
+  );
+
+  // Keep refs updated with latest values
+  useEffect(() => {
+    latestSlicesRef.current = slices;
+  }, [slices]);
+
+  useEffect(() => {
+    latestSelectedSliceIdsSetRef.current = selectedSliceIdsSet;
+  }, [selectedSliceIdsSet]);
+
+  const filteredSlices = useMemo(
+    () =>
+      getFilteredSortedSlices(
+        slices,
         searchTerm,
-        prevState.sortBy,
-        prevState.showOnlyMyCharts,
-        this.props.userId,
-      ),
-    }));
-  }
-
-  handleSelect(sortBy: keyof Slice) {
-    this.setState(prevState => ({
-      sortBy,
-      filteredSlices: getFilteredSortedSlices(
-        this.props.slices,
-        prevState.searchTerm,
         sortBy,
-        prevState.showOnlyMyCharts,
-        this.props.userId,
-      ),
-    }));
-    this.slicesRequest = this.props.fetchSlices(
-      this.userIdForFetch(),
-      this.state.searchTerm,
-      sortBy,
-    );
-  }
-
-  rowRenderer({ index, style }: { index: number; style: React.CSSProperties }) 
{
-    const { filteredSlices, selectedSliceIdsSet } = this.state;
-    const cellData = filteredSlices[index];
-
-    const isSelected = selectedSliceIdsSet.has(cellData.slice_id);
-    const type = CHART_TYPE;
-    const id = NEW_CHART_ID;
-
-    const meta = {
-      chartId: cellData.slice_id,
-      sliceName: cellData.slice_name,
-    };
-    return (
-      <DragDroppable
-        key={cellData.slice_id}
-        component={{ type, id, meta }}
-        parentComponent={{
-          id: NEW_COMPONENTS_SOURCE_ID,
-          type: NEW_COMPONENT_SOURCE_TYPE,
-        }}
-        index={index}
-        depth={0}
-        disableDragDrop={isSelected}
-        editMode={this.props.editMode}
-        // we must use a custom drag preview within the List because
-        // it does not seem to work within a fixed-position container
-        useEmptyDragPreview
-        // List library expect style props here
-        // actual style should be applied to nested AddSliceCard component
-        style={{}}
-      >
-        {({ dragSourceRef }: { dragSourceRef: ConnectDragSource }) => (
-          <AddSliceCard
-            innerRef={dragSourceRef}
-            style={style}
-            sliceName={cellData.slice_name}
-            lastModified={cellData.changed_on_humanized}
-            visType={cellData.viz_type}
-            datasourceUrl={cellData.datasource_url}
-            datasourceName={cellData.datasource_name}
-            thumbnailUrl={cellData.thumbnail_url}
-            isSelected={isSelected}
-          />
-        )}
-      </DragDroppable>
-    );
-  }
-
-  onShowOnlyMyCharts = (showOnlyMyCharts: boolean) => {
-    if (!showOnlyMyCharts) {
-      this.slicesRequest = this.props.fetchSlices(
-        undefined,
-        this.state.searchTerm,
-        this.state.sortBy,
-      );
-    }
-    this.setState(prevState => ({
-      showOnlyMyCharts,
-      filteredSlices: getFilteredSortedSlices(
-        this.props.slices,
-        prevState.searchTerm,
-        prevState.sortBy,
         showOnlyMyCharts,
-        this.props.userId,
+        userId,
       ),
-    }));
-    setItem(LocalStorageKeys.DashboardEditorShowOnlyMyCharts, 
showOnlyMyCharts);
-  };
+    [slices, searchTerm, sortBy, showOnlyMyCharts, userId],
+  );
+
+  const userIdForFetch = useCallback(
+    () => (showOnlyMyCharts ? userId : undefined),
+    [showOnlyMyCharts, userId],
+  );
+
+  // componentDidMount
+  useEffect(() => {
+    slicesRequestRef.current = fetchSlices(userIdForFetch(), '', sortBy);
+    // Only run on mount
+    // eslint-disable-next-line react-hooks/exhaustive-deps

Review Comment:
   Thread closed — the eslint-plugin-react-hooks package is in devDependencies 
and react-hooks/recommended (which enables exhaustive-deps) is active in 
.eslintrc.js. Bito's static analysis toolchain failed to locate the rule 
locally; the disable comment is valid and CI confirms it. Bito's recurring 
responses are a loop artifact from /resolve not being supported on inline 
comments. No further action needed.



##########
superset-frontend/src/dashboard/components/gridComponents/Markdown/Markdown.tsx:
##########
@@ -140,193 +132,200 @@ interface DragChildProps {
   dragSourceRef: React.RefCallback<HTMLElement>;
 }
 
-class Markdown extends PureComponent<MarkdownProps, MarkdownState> {
-  renderStartTime: number;
-
-  constructor(props: MarkdownProps) {
-    super(props);
-    this.state = {
-      isFocused: false,
-      markdownSource: props.component.meta.code as string,
-      editor: null,
-      editorMode: 'preview',
-      undoLength: props.undoLength,
-      redoLength: props.redoLength,
-    };
-    this.renderStartTime = Logger.getTimestamp();
-
-    this.handleChangeFocus = this.handleChangeFocus.bind(this);
-    this.handleChangeEditorMode = this.handleChangeEditorMode.bind(this);
-    this.handleMarkdownChange = this.handleMarkdownChange.bind(this);
-    this.handleDeleteComponent = this.handleDeleteComponent.bind(this);
-    this.handleResizeStart = this.handleResizeStart.bind(this);
-    this.setEditor = this.setEditor.bind(this);
-    this.shouldFocusMarkdown = this.shouldFocusMarkdown.bind(this);
-  }
-
-  componentDidMount(): void {
-    this.props.logEvent(LOG_ACTIONS_RENDER_CHART, {
-      viz_type: 'markdown',
-      start_offset: this.renderStartTime,
-      ts: new Date().getTime(),
-      duration: Logger.getTimestamp() - this.renderStartTime,
-    });
-  }
-
-  static getDerivedStateFromProps(
-    nextProps: MarkdownProps,
-    state: MarkdownState,
-  ): MarkdownState | null {
-    const { hasError, editorMode, markdownSource, undoLength, redoLength } =
-      state;
-    const {
-      component: nextComponent,
-      undoLength: nextUndoLength,
-      redoLength: nextRedoLength,
-    } = nextProps;
-    // user click undo or redo ?
-    if (nextUndoLength !== undoLength || nextRedoLength !== redoLength) {
-      return {
-        ...state,
-        undoLength: nextUndoLength,
-        redoLength: nextRedoLength,
-        markdownSource: nextComponent.meta.code as string,
-        hasError: false,
-      };
-    }
+function Markdown({
+  id,
+  parentId,
+  component,
+  parentComponent,
+  index,
+  depth,
+  editMode,
+  availableColumnCount,
+  columnWidth,
+  onResizeStart,
+  onResize,
+  onResizeStop,
+  deleteComponent,
+  handleComponentDrop,
+  updateComponents,
+  logEvent,
+  addDangerToast,
+  undoLength,
+  redoLength,
+  htmlSanitization,
+  htmlSchemaOverrides,
+}: MarkdownProps) {
+  const [isFocused, setIsFocused] = useState(false);
+  const [markdownSource, setMarkdownSource] = useState<string>(
+    component.meta.code as string,
+  );
+  const [editor, setEditorState] = useState<EditorInstance | null>(null);
+  const [editorMode, setEditorMode] = useState<'preview' | 'edit'>('preview');
+  const [hasError, setHasError] = useState(false);
+
+  const renderStartTimeRef = useRef(Logger.getTimestamp());
+  const prevUndoLengthRef = useRef(undoLength);
+  const prevRedoLengthRef = useRef(redoLength);
+  const prevComponentWidthRef = useRef(component.meta.width);
+  const prevColumnWidthRef = useRef(columnWidth);
+
+  // getDerivedStateFromProps equivalent: handle undo/redo and external code 
changes
+  useEffect(() => {
+    // user click undo or redo?
     if (
+      undoLength !== prevUndoLengthRef.current ||
+      redoLength !== prevRedoLengthRef.current
+    ) {
+      setMarkdownSource(component.meta.code as string);
+      setHasError(false);
+      prevUndoLengthRef.current = undoLength;
+      prevRedoLengthRef.current = redoLength;
+    } else if (
       !hasError &&
       editorMode === 'preview' &&
-      nextComponent.meta.code !== markdownSource
+      component.meta.code !== markdownSource
     ) {
-      return {
-        ...state,
-        markdownSource: nextComponent.meta.code as string,
-      };
+      setMarkdownSource(component.meta.code as string);
     }
+  }, [
+    undoLength,
+    redoLength,
+    component.meta.code,
+    hasError,
+    editorMode,
+    markdownSource,
+  ]);

Review Comment:
   Thread closed — markdownSource must remain in the dependency array because 
the effect reads it in its conditional check (component.meta.code !== 
markdownSource) before deciding whether to set it; removing it would freeze the 
comparison at the initial value. The suggestion has been reviewed and declined. 
Bito's recurring responses are a loop artifact from /resolve not being 
supported on inline comments. No further action needed.



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