chore: Fix layout issues for UI package editor (#40349)

## Description
🏗 Architecture
- Moved mainCanvasReducer from Community Edition (CE) to Enterprise
Edition (EE) structure
- Added proper export structure in EE to maintain backward compatibility
- Added RESET_EDITOR_REQUEST handler to reset canvas state when needed
- 
🐛 Bug Fixes
- Fixed widget tag grouping in groupWidgetCardsByTags to properly handle
tags that aren't predefined
- Implemented support for overrideRenderMode in both
LayoutSystemBasedCanvas and withWidgetProps
- Added emptyMessage prop in UIEntitySidebar for improved user
experience

PR for https://github.com/appsmithorg/appsmith-ee/pull/7245

## Automation

/ok-to-test tags="@tag.All"

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/14610885832>
> Commit: 54916f79b3009451298496513e0a3a8ee7bccdac
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=14610885832&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.All`
> Spec:
> <hr>Wed, 23 Apr 2025 07:02:40 UTC
<!-- end of auto-generated comment: Cypress test results  -->


## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Added support for customizing the empty message in the widget sidebar
when no widgets are found.
- Introduced an option to override the widget render mode in both the
canvas and widget components, enabling more flexible widget behavior in
the editor.

- **Bug Fixes**
- Improved grouping of widget cards by tags to prevent potential errors
when encountering new tags.

- **Refactor**
- Updated internal reducer structure and export patterns for improved
maintainability.
- Adjusted import paths for better modularization and separation between
core and enterprise code.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/src/ce/reducers/index.tsx

@@ -48,7 +48,7 @@ import type { CrudInfoModalReduxState } from "reducers/uiReducers/crudInfoModalR
 import type { FormEvaluationState } from "reducers/evaluationReducers/formEvaluationReducer";
 import type { widgetReflow } from "reducers/uiReducers/reflowReducer";
 import type { AppThemingState } from "reducers/uiReducers/appThemingReducer";
-import type { MainCanvasReduxState } from "reducers/uiReducers/mainCanvasReducer";
+import type { MainCanvasReduxState } from "ee/reducers/uiReducers/mainCanvasReducer";
 import type { SettingsReduxState } from "ee/reducers/settingsReducer";
 import SettingsReducer from "ee/reducers/settingsReducer";
 import type { TriggerValuesEvaluationState } from "reducers/evaluationReducers/triggerReducer";

app/client/src/ce/reducers/uiReducers/index.tsx

@@ -33,7 +33,7 @@ import crudInfoModalReducer from "reducers/uiReducers/crudInfoModalReducer";
 import { widgetReflowReducer } from "reducers/uiReducers/reflowReducer";
 import jsObjectNameReducer from "reducers/uiReducers/jsObjectNameReducer";
 import appThemingReducer from "reducers/uiReducers/appThemingReducer";
-import mainCanvasReducer from "reducers/uiReducers/mainCanvasReducer";
+import mainCanvasReducer from "ee/reducers/uiReducers/mainCanvasReducer";
 import focusHistoryReducer from "reducers/uiReducers/focusHistoryReducer";
 import { editorContextReducer } from "ee/reducers/uiReducers/editorContextReducer";
 import libraryReducer from "reducers/uiReducers/libraryReducer";

app/client/src/ce/reducers/uiReducers/mainCanvasReducer.ts

@@ -7,15 +7,16 @@ import {
 } from "constants/WidgetConstants";
 import type { UpdateCanvasLayoutPayload } from "actions/controlActions";
 import type { UpdateCanvasPayload } from "actions/pageActions";
+import { klona } from "klona";
 
-const initialState: MainCanvasReduxState = {
+export const initialState: MainCanvasReduxState = {
   initialized: false,
   width: 0,
   height: 0,
   isMobile: false,
 };
 
-const mainCanvasReducer = createImmerReducer(initialState, {
+export const handlers = {
   [ReduxActionTypes.INIT_CANVAS_LAYOUT]: (
     state: MainCanvasReduxState,
     action: ReduxAction<UpdateCanvasPayload>,
@@ -38,7 +39,12 @@ const mainCanvasReducer = createImmerReducer(initialState, {
     state.isMobile =
       action.payload.width <= layoutConfigurations.MOBILE.maxWidth;
   },
-});
+  [ReduxActionTypes.RESET_EDITOR_REQUEST]: () => {
+    return klona(initialState);
+  },
+};
+
+const mainCanvasReducer = createImmerReducer(initialState, handlers);
 
 export interface MainCanvasReduxState {
   initialized: boolean;

app/client/src/ce/sagas/PageSagas.tsx

@@ -126,7 +126,7 @@ import { getPageList } from "ee/selectors/entitiesSelector";
 import { setPreviewModeAction } from "actions/editorActions";
 import { SelectionRequestType } from "sagas/WidgetSelectUtils";
 import { toast } from "@appsmith/ads";
-import type { MainCanvasReduxState } from "reducers/uiReducers/mainCanvasReducer";
+import type { MainCanvasReduxState } from "ee/reducers/uiReducers/mainCanvasReducer";
 import { UserCancelledActionExecutionError } from "sagas/ActionExecution/errorUtils";
 import { getInstanceId } from "ee/selectors/organizationSelectors";
 import { MAIN_CONTAINER_WIDGET_ID } from "constants/WidgetConstants";

app/client/src/ee/reducers/uiReducers/mainCanvasReducer.ts

@@ -0,0 +1,3 @@
+export * from "ce/reducers/uiReducers/mainCanvasReducer";
+import { default as CE_mainCanvasReducer } from "ce/reducers/uiReducers/mainCanvasReducer";
+export default CE_mainCanvasReducer;

app/client/src/layoutSystems/CanvasFactory.tsx

@@ -16,9 +16,19 @@ import { getAppThemeSettings } from "ee/selectors/applicationSelectors";
  */
 
 const LayoutSystemBasedCanvas = memo((props: WidgetProps) => {
-  const renderMode = useSelector(getRenderMode);
+  let renderMode = useSelector(getRenderMode);
   const themeSetting = useSelector(getAppThemeSettings);
 
+  // This is primarily used by UI modules in app editor where it wants to load all the underlying
+  // widgets in page mode as they are not editable and mimics the behavior of view mode.
+  // Since in app's edit mode the default render mode is canvas and due to this some widgets do not behave
+  // properly.
+  // Ideally the renderMode from props should be used instead of the one from the selector but that needs
+  // to be handled properly as it needs a bigger change and more testing.
+  if (props.overrideRenderMode) {
+    renderMode = props.overrideRenderMode;
+  }
+
   const layoutSystemType = useSelector(getLayoutSystemType);
   const { canvasSystem } = useMemo(
     () => getLayoutSystem(renderMode, layoutSystemType),

app/client/src/pages/AppIDE/components/WidgetAdd/WidgetsList.tsx

@@ -5,6 +5,7 @@ import UIEntitySidebar from "pages/Editor/widgetSidebar/UIEntitySidebar";
 import {
   createMessage,
   UI_ELEMENT_PANEL_SEARCH_TEXT,
+  WIDGET_PANEL_EMPTY_MESSAGE,
 } from "ee/constants/messages";
 
 interface WidgetsListProps {
@@ -17,6 +18,7 @@ function WidgetsList({ focusSearchInput }: WidgetsListProps) {
   return (
     <UIEntitySidebar
       cards={cards}
+      emptyMessage={createMessage(WIDGET_PANEL_EMPTY_MESSAGE)}
       entityLoading={entityLoading}
       focusSearchInput={focusSearchInput}
       groupedCards={groupedCards}

app/client/src/pages/Editor/utils.tsx

@@ -328,6 +328,8 @@ export const groupWidgetCardsByTags = (widgetCards: WidgetCardProps[]) => {
       item.tags.forEach((tag) => {
         if (groupedCards[tag]) {
           groupedCards[tag].push(item);
+        } else {
+          groupedCards[tag] = [item];
         }
       });
     }

app/client/src/pages/Editor/widgetSidebar/UIEntitySidebar.tsx

@@ -1,7 +1,3 @@
-import {
-  WIDGET_PANEL_EMPTY_MESSAGE,
-  createMessage,
-} from "ee/constants/messages";
 import AnalyticsUtil from "ee/utils/AnalyticsUtil";
 import { ENTITY_EXPLORER_SEARCH_ID } from "constants/Explorer";
 import type {
@@ -23,10 +19,12 @@ interface UIEntitySidebarProps {
   entityLoading?: Partial<Record<WidgetTags, boolean>>;
   groupedCards: WidgetCardsGroupedByTags;
   searchPlaceholderText?: string;
+  emptyMessage?: string;
 }
 
 function UIEntitySidebar({
   cards,
+  emptyMessage,
   entityLoading,
   focusSearchInput,
   groupedCards,
@@ -133,8 +131,7 @@ function UIEntitySidebar({
             renderAs="p"
             style={{ marginBottom: "15px" }}
           >
-            {createMessage(WIDGET_PANEL_EMPTY_MESSAGE)} `
-            {searchInputRef.current?.value}`
+            {emptyMessage} `{searchInputRef.current?.value}`
           </Text>
         )}
         <div>

app/client/src/sagas/AutoLayoutUpdateSagas.tsx

@@ -38,7 +38,7 @@ import {
   getIsAutoLayoutMobileBreakPoint,
   getMainCanvasProps,
 } from "selectors/editorSelectors";
-import type { MainCanvasReduxState } from "reducers/uiReducers/mainCanvasReducer";
+import type { MainCanvasReduxState } from "ee/reducers/uiReducers/mainCanvasReducer";
 import { updateLayoutForMobileBreakpointAction } from "actions/autoLayoutActions";
 import convertDSLtoAuto from "layoutSystems/common/DSLConversions/fixedToAutoLayout";
 import { convertNormalizedDSLToFixed } from "layoutSystems/common/DSLConversions/autoToFixedLayout";

app/client/src/sagas/CanvasSagas/DraggingCanvasSagas.ts

@@ -26,7 +26,7 @@ import type {
   CanvasWidgetsReduxState,
   FlattenedWidgetProps,
 } from "ee/reducers/entityReducers/canvasWidgetsReducer";
-import type { MainCanvasReduxState } from "reducers/uiReducers/mainCanvasReducer";
+import type { MainCanvasReduxState } from "ee/reducers/uiReducers/mainCanvasReducer";
 import { all, call, put, select, takeLatest } from "redux-saga/effects";
 import { addAndMoveBuildingBlockToCanvasSaga } from "sagas/BuildingBlockSagas/BuildingBlockAdditionSagas";
 import { getUpdateDslAfterCreatingChild } from "sagas/WidgetAdditionSagas";

app/client/src/selectors/editorSelectors.tsx

@@ -25,7 +25,7 @@ import {
   getLoadingEntities,
   getConfigTree,
 } from "selectors/dataTreeSelectors";
-import type { MainCanvasReduxState } from "reducers/uiReducers/mainCanvasReducer";
+import type { MainCanvasReduxState } from "ee/reducers/uiReducers/mainCanvasReducer";
 
 import { getActionEditorSavingMap } from "PluginActionEditor/store";
 import {

app/client/src/widgets/withWidgetProps.tsx

@@ -82,7 +82,7 @@ function withWidgetProps(WrappedWidget: typeof BaseWidget) {
       getMainCanvasProps(state),
     );
     const googleMapsApiKey = useSelector(getGoogleMapsApiKey);
-    const renderMode = useSelector(getRenderMode);
+    let renderMode = useSelector(getRenderMode);
 
     const widgetName = canvasWidget?.widgetName || metaWidget?.widgetName;
 
@@ -155,6 +155,14 @@ function withWidgetProps(WrappedWidget: typeof BaseWidget) {
 
     const widget = metaWidget || canvasWidget;
 
+    // This property is primarily used by UI modules in app editor where it wants to load all the underlying
+    // widgets in page mode as they are not editable and mimics the behavior of view mode.
+    // Since in app's edit mode the default render mode is canvas and due to this some widgets do not behave
+    // properly.
+    if (widget?.overrideRenderMode) {
+      renderMode = widget.overrideRenderMode;
+    }
+
     if (!skipWidgetPropsHydration) {
       const canvasWidgetProps = (() => {
         if (widgetId === MAIN_CONTAINER_WIDGET_ID) {