First attempt to make the edition works in the WysiwygComposer

src/components/views/rooms/wysiwyg_composer/hooks/useWysiwygSendActionHandler.ts

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+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { RefObject, useCallback, useRef } from "react";
+
+import defaultDispatcher from "../../../../../dispatcher/dispatcher";
+import { Action } from "../../../../../dispatcher/actions";
+import { ActionPayload } from "../../../../../dispatcher/payloads";
+import { TimelineRenderingType, useRoomContext } from "../../../../../contexts/RoomContext";
+import { useDispatcher } from "../../../../../hooks/useDispatcher";
+import { Wysiwyg } from "../types";
+import { focusComposer } from "./utils";
+
+export function useWysiwygSendActionHandler(
+    disabled: boolean,
+    composerElement: RefObject<HTMLElement>,
+    wysiwyg: Wysiwyg,
+) {
+    const roomContext = useRoomContext();
+    const timeoutId = useRef<number>();
+
+    const handler = useCallback((payload: ActionPayload) => {
+        // don't let the user into the composer if it is disabled - all of these branches lead
+        // to the cursor being in the composer
+        if (disabled || !composerElement.current) return;
+
+        const context = payload.context ?? TimelineRenderingType.Room;
+
+        switch (payload.action) {
+            case "reply_to_event":
+            case Action.FocusSendMessageComposer:
+                focusComposer(composerElement, context, roomContext, timeoutId);
+                break;
+            case Action.ClearAndFocusSendMessageComposer:
+                wysiwyg.clear();
+                focusComposer(composerElement, context, roomContext, timeoutId);
+                break;
+            // TODO: case Action.ComposerInsert: - see SendMessageComposer
+        }
+    }, [disabled, composerElement, wysiwyg, timeoutId, roomContext]);
+
+    useDispatcher(defaultDispatcher, handler);
+}