Desktop: Resolves #2059: Add option to transform HTML notes into Markdown (#12730)

Co-authored-by: Laurent Cozic <laurent22@users.noreply.github.com>

packages/app-desktop/gui/ConversionNotification/ConversionNotification.tsx

@@ -0,0 +1,28 @@
+import * as React from 'react';
+import { useContext, useEffect } from 'react';
+import { _ } from '@joplin/lib/locale';
+import { Dispatch } from 'redux';
+import { PopupNotificationContext } from '../PopupNotification/PopupNotificationProvider';
+import { NotificationType } from '../PopupNotification/types';
+
+interface Props {
+	noteId: string;
+	dispatch: Dispatch;
+}
+
+export default (props: Props) => {
+	const popupManager = useContext(PopupNotificationContext);
+
+	useEffect(() => {
+		if (!props.noteId || props.noteId === '') return;
+
+		props.dispatch({ type: 'NOTE_HTML_TO_MARKDOWN_DONE', value: '' });
+
+		const notification = popupManager.createPopup(() => (
+			<div>{_('The note has been converted to Markdown and the original note has been moved to the trash')}</div>
+		), { type: NotificationType.Success });
+		notification.scheduleDismiss();
+	}, [props.dispatch, popupManager, props.noteId]);
+
+	return <div style={{ display: 'none' }}/>;
+};