Mobile: Fixes #11264: Fix editor shows nothing when there are no selected note IDs (#11514)

packages/app-mobile/components/ScreenHeader/index.tsx

@@ -550,7 +550,14 @@ class ScreenHeaderComponent extends PureComponent<ScreenHeaderProps, ScreenHeade
 
 							try {
 								for (let i = 0; i < noteIds.length; i++) {
-									await Note.moveToFolder(noteIds[i], folderId);
+									await Note.moveToFolder(
+										noteIds[i],
+										folderId,
+										// By default, the note selection is preserved on mobile when a note is moved to
+										// a different folder. However, when moving notes from the note list, this shouldn't be
+										// the case:
+										{ dispatchOptions: { preserveSelection: false } },
+									);
 								}
 							} catch (error) {
 								alert(_n('This note could not be moved: %s', 'These notes could not be moved: %s', noteIds.length, error.message));

packages/app-mobile/components/screens/Note/Note.tsx

@@ -45,7 +45,7 @@ import { isSupportedLanguage } from '../../../services/voiceTyping/vosk';
 import { ChangeEvent as EditorChangeEvent, SelectionRangeChangeEvent, UndoRedoDepthChangeEvent } from '@joplin/editor/events';
 import { join } from 'path';
 import { Dispatch } from 'redux';
-import { RefObject, useContext, useRef } from 'react';
+import { RefObject, useContext } from 'react';
 import { SelectionRange } from '../../NoteEditor/types';
 import { getNoteCallbackUrl } from '@joplin/lib/callbackUrlUtils';
 import { AppState } from '../../../utils/types';
@@ -1615,19 +1615,9 @@ class NoteScreenComponent extends BaseScreenComponent<ComponentProps, State> imp
 // which can cause some bugs where previously set state to another note would interfere
 // how the new note should be rendered
 const NoteScreenWrapper = (props: Props) => {
-	const lastNonNullNoteIdRef = useRef(props.noteId);
-	if (props.noteId) {
-		lastNonNullNoteIdRef.current = props.noteId;
-	}
-
-	// This keeps the current note open even if it's no longer present in selectedNoteIds.
-	// This might happen, for example, if the selected note is moved to an unselected
-	// folder.
-	const noteId = lastNonNullNoteIdRef.current;
-
 	const dialogs = useContext(DialogContext);
 	return (
-		<NoteScreenComponent key={noteId} dialogs={dialogs} {...props} />
+		<NoteScreenComponent key={props.noteId} dialogs={dialogs} {...props} />
 	);
 };
 

packages/app-mobile/components/screens/Notes.tsx

@@ -35,6 +35,7 @@ interface Props {
 	showCompletedTodos: boolean;
 	noteSelectionEnabled: boolean;
 
+	selectedNoteIds: string[];
 	activeFolderId: string;
 	selectedFolderId: string;
 	selectedTagId: string;

packages/app-mobile/utils/appDefaultState.ts

@@ -18,5 +18,8 @@ const appDefaultState: AppState = {
 	showPanelsDialog: false,
 	newNoteAttachFileAction: null,
 	...defaultState,
+
+	// On mobile, it's possible to select notes that aren't in the selected folder/tag/etc.
+	allowSelectionInOtherFolders: true,
 };
 export default appDefaultState;

packages/lib/reducer.test.ts

@@ -709,13 +709,19 @@ describe('reducer', () => {
 
 	// Regression test for #10589.
 	it.each([
-		true, false,
-	])('should preserve note selection if specified while moving a note (preserveSelection: %j)', async (preserveSelection) => {
+		[true, false],
+		[undefined, false],
+		[undefined, true],
+		[false, true],
+	])('should preserve note selection if specified with an option (preserveSelection: %j, allowSelectionInOtherFolders: %j)', async (
+		preserveSelectionOption, allowSelectionInOtherFolders,
+	) => {
 		const folders = await createNTestFolders(3);
 		const notes = await createNTestNotes(5, folders[0]);
 
 		// select the 1st folder and the 1st note
 		let state = initTestState(folders, 0, notes, [0]);
+		state = { ...state, allowSelectionInOtherFolders };
 		state = goToNote(notes, [0], state);
 
 		expect(state.selectedNoteIds).toHaveLength(1);
@@ -729,11 +735,15 @@ describe('reducer', () => {
 		await Note.moveToFolder(
 			state.selectedNoteIds[0],
 			folders[1].id,
-			preserveSelection ? { dispatchOptions: { preserveSelection: true } } : undefined,
+			{ dispatchOptions: { preserveSelection: preserveSelectionOption } },
 		);
 
 		expect(BaseModel.dispatch).toHaveBeenCalled();
-		if (preserveSelection) {
+
+		// preserveSelectionOption takes precedence over allowSelectionInOtherFolders
+		const shouldPreserveSelection = preserveSelectionOption ?? allowSelectionInOtherFolders;
+
+		if (shouldPreserveSelection) {
 			expect(state.selectedNoteIds).toMatchObject([notes[0].id]);
 		} else {
 			expect(state.selectedNoteIds).toMatchObject([notes[1].id]);
@@ -743,6 +753,27 @@ describe('reducer', () => {
 		expect(state.selectedFolderId).toBe(folders[0].id);
 	});
 
+	test('when selection is allowed in unselected folders, NOTE_UPDATE_ALL should not remove items from the selection', async () => {
+		const folders = await createNTestFolders(2);
+		const notes = await createNTestNotes(2, folders[0]);
+
+		// select the 1st folder and the 1st note
+		let state = initTestState(folders, 0, notes, [0]);
+		state = { ...state, allowSelectionInOtherFolders: true };
+		state = goToNote(notes, [0], state);
+
+		expect(state.selectedNoteIds).toEqual([notes[0].id]);
+		expect(state.notes).toHaveLength(2);
+
+		state = reducer(state, {
+			type: 'NOTE_UPDATE_ALL',
+			notes: [],
+		});
+
+		expect(state.notes).toHaveLength(0);
+		expect(state.selectedNoteIds).toEqual([notes[0].id]);
+	});
+
 	// window tests
 	test('switching windows should move state from background to the foreground', async () => {
 		const folders = await createNTestFolders(2);

packages/lib/reducer.ts

@@ -169,6 +169,8 @@ export interface State extends WindowState {
 	mustUpgradeAppMessage: string;
 	mustAuthenticate: boolean;
 
+	allowSelectionInOtherFolders: boolean;
+
 	// Extra reducer keys go here:
 	pluginService: PluginServiceState;
 	shareService: ShareServiceState;
@@ -236,6 +238,7 @@ export const defaultState: State = {
 	lastDeletionNotificationTime: 0,
 	mustUpgradeAppMessage: '',
 	mustAuthenticate: false,
+	allowSelectionInOtherFolders: false,
 
 	pluginService: pluginServiceDefaultState,
 	shareService: shareServiceDefaultState,
@@ -1080,7 +1083,9 @@ const reducer = produce((draft: Draft<State> = defaultState, action: any) => {
 			draft.notes = action.notes;
 			draft.notesSource = action.notesSource;
 			draft.noteListLastSortTime = Date.now(); // Notes are already sorted when they are set this way.
-			updateSelectedNotesFromExistingNotes(draft);
+			if (!draft.allowSelectionInOtherFolders) {
+				updateSelectedNotesFromExistingNotes(draft);
+			}
 			break;
 
 			// Insert the note into the note list if it's new, or
@@ -1148,7 +1153,8 @@ const reducer = produce((draft: Draft<State> = defaultState, action: any) => {
 					// For example, if the user drags the current note to a different folder,
 					// a new note should be selected.
 					// In some cases, however, the selection needs to be preserved (e.g. the mobile app).
-					if (noteFolderHasChanged && !action.preserveSelection) {
+					const preserveSelection = action.preserveSelection ?? draft.allowSelectionInOtherFolders;
+					if (noteFolderHasChanged && !preserveSelection) {
 						let newIndex = movedNotePreviousIndex;
 						if (newIndex >= newNotes.length) newIndex = newNotes.length - 1;
 						if (!newNotes.length) newIndex = -1;