Happily handle empty text messages (#6825)

This commig refactors the message-deletion modal and reuses it for case of removing
the entire message and trying to send it, which should trigger removal flow instead.

Fix vector-im/element-web#18873

src/components/views/dialogs/ConfirmRedactDialog.tsx

@@ -14,9 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import { MatrixEvent } from 'matrix-js-sdk/src/models/event';
 import React from 'react';
 import { _t } from '../../../languageHandler';
+import { MatrixClientPeg } from '../../../MatrixClientPeg';
+import Modal from '../../../Modal';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import ErrorDialog from './ErrorDialog';
 import TextInputDialog from "./TextInputDialog";
 
 interface IProps {
@@ -42,3 +46,40 @@ export default class ConfirmRedactDialog extends React.Component<IProps> {
         );
     }
 }
+
+export function createRedactEventDialog({
+    mxEvent,
+    onCloseDialog = () => {},
+}: {
+    mxEvent: MatrixEvent;
+    onCloseDialog?: () => void;
+}) {
+    Modal.createTrackedDialog('Confirm Redact Dialog', '', ConfirmRedactDialog, {
+        onFinished: async (proceed: boolean, reason?: string) => {
+            if (!proceed) return;
+
+            const cli = MatrixClientPeg.get();
+            try {
+                onCloseDialog?.();
+                await cli.redactEvent(
+                    mxEvent.getRoomId(),
+                    mxEvent.getId(),
+                    undefined,
+                    reason ? { reason } : {},
+                );
+            } catch (e) {
+                const code = e.errcode || e.statusCode;
+                // only show the dialog if failing for something other than a network error
+                // (e.g. no errcode or statusCode) as in that case the redactions end up in the
+                // detached queue and we show the room status bar to allow retry
+                if (typeof code !== "undefined") {
+                    // display error message stating you couldn't delete this.
+                    Modal.createTrackedDialog('You cannot delete this message', '', ErrorDialog, {
+                        title: _t('Error'),
+                        description: _t('You cannot delete this message. (%(code)s)', { code }),
+                    });
+                }
+            }
+        },
+    }, 'mx_Dialog_confirmredact');
+}