feat: add option to disable message preprocessing in the internal appconfiguration

.gitignore

@@ -44,3 +44,4 @@ dist/
 lib/
 
 plans/
+/.codex/

apps/webapp/src/script/components/ConfigToolbar/ConfigToolbar.styles.tsx

@@ -31,3 +31,7 @@ export const wrapperStyles: CSSObject = {
   zIndex: 100000000,
   boxShadow: '3px 1px 6px 1px #000',
 };
+
+export const messagePreprocessingSwitchStyles: CSSObject = {
+  marginBottom: '10px',
+};

apps/webapp/src/script/components/ConfigToolbar/ConfigToolbar.tsx

@@ -29,7 +29,7 @@
 import {useClickOutside} from 'src/script/hooks/useClickOutside';
 import {CoreCryptoLogLevel} from 'Util/debugUtil';
 
-import {wrapperStyles} from './ConfigToolbar.styles';
+import {messagePreprocessingSwitchStyles, wrapperStyles} from './ConfigToolbar.styles';
 
 export function ConfigToolbar() {
   const [showConfig, setShowConfig] = useState(false);
@@ -48,6 +48,9 @@
   const [videoBackgroundEffectsFeatureEnabled, setVideoBackgroundEffectsFeatureEnabled] = useState(
     window.wire?.app?.debug?.isVideoBackgroundEffectsFeatureEnabled() ?? false,
   );
+  const [isMessagePreprocessingDisabled, setIsMessagePreprocessingDisabled] = useState(
+    window.wire?.app?.debug?.isMessagePreprocessingDisabled() ?? false,
+  );
   const [coreCryptoLevel, setCoreCryptoLevel] = useState<CoreCryptoLogLevel>(CoreCryptoLogLevel.Info);
 
   // Toggle config tool on 'cmd/ctrl + shift + 2'
@@ -264,6 +267,23 @@
     );
   };
 
+  const renderMessagePreprocessingSwitch = () => {
+    return (
+      <div css={messagePreprocessingSwitchStyles}>
+        <label htmlFor="message-preprocessing-checkbox" style={{display: 'block', fontWeight: 'bold'}}>
+          DISABLE MESSAGE PREPROCESSING
+        </label>
+        <Switch
+          id="message-preprocessing-checkbox"
+          checked={isMessagePreprocessingDisabled}
+          onToggle={isChecked => {
+            setIsMessagePreprocessingDisabled(window.wire?.app?.debug?.disableMessagePreprocessing(isChecked) === true);
+          }}
+        />
+      </div>
+    );
+  };
+
   const renderCoreCryptoLogLevelSelect = () => {
     const options: Array<{label: string; value: CoreCryptoLogLevel}> = [
       {label: 'Off', value: CoreCryptoLogLevel.Off},
@@ -285,7 +305,7 @@
           onChange={event => {
             const val = Number(event.currentTarget.value) as CoreCryptoLogLevel;
             setCoreCryptoLevel(val);
             void window.wire?.app?.debug?.setCoreCryptoMaxLogLevel(val);
           }}
           style={{padding: '6px 8px'}}
         >
@@ -351,6 +371,10 @@
 
       <hr />
 
+      <div>{renderMessagePreprocessingSwitch()}</div>
+
+      <hr />
+
       <div>{renderCoreCryptoLogLevelSelect()}</div>
 
       <hr />

apps/webapp/src/script/components/InputBar/InputBar.tsx

@@ -17,8 +17,9 @@
  *
  */
 
-import {useCallback, useRef, useState} from 'react';
+import {useCallback, useEffect, useRef, useState} from 'react';
 
+import is from '@sindresorhus/is';
 import {amplify} from 'amplify';
 import cx from 'classnames';
 import {LexicalEditor, $createTextNode, $insertNodes} from 'lexical';
@@ -45,6 +46,7 @@
 import {EventName} from 'Repositories/tracking/EventName';
 import {CONVERSATION_TYPING_INDICATOR_MODE} from 'Repositories/user/TypingIndicatorMode';
 import {useKoSubscribableChildren} from 'Util/componentUtil';
+import {DISABLE_MESSAGE_PREPROCESSING_EVENT, isMessagePreprocessingDisabled} from 'Util/debugMessagePreprocessingUtil';
 import {t} from 'Util/localizerUtil';
 import {TIME_IN_MILLIS} from 'Util/timeUtil';
 
@@ -148,6 +150,7 @@
    * It's directly derived from the editor state
    */
   const [messageContent, setMessageContent] = useState<MessageContent>({text: ''});
+  const [disableMessagePreprocessing, setDisableMessagePreprocessing] = useState(isMessagePreprocessingDisabled);
 
   const formatToolbar = useFormatToolbar();
 
@@ -206,6 +209,22 @@
     () => propertiesRepository.getPreference(PROPERTIES_TYPE.INTERFACE.MARKDOWN_PREVIEW),
     WebAppEvents.PROPERTIES.UPDATE.INTERFACE.MARKDOWN_PREVIEW,
   );
+  const effectiveShowMarkdownPreview = showMarkdownPreview && !disableMessagePreprocessing;
+
+  useEffect(() => {
+    const handleMessagePreprocessingChange = (event: Event) => {
+      const isDisabled =
+        event instanceof CustomEvent && is.boolean(event.detail) ? event.detail : isMessagePreprocessingDisabled();
+
+      setDisableMessagePreprocessing(isDisabled);
+    };
+
+    window.addEventListener(DISABLE_MESSAGE_PREPROCESSING_EVENT, handleMessagePreprocessingChange);
+
+    return () => {
+      window.removeEventListener(DISABLE_MESSAGE_PREPROCESSING_EVENT, handleMessagePreprocessingChange);
+    };
+  }, []);
 
   const {
     editedMessage,
@@ -232,6 +251,7 @@
     editorRef,
     pastedFile: fileHandling.pastedFile,
     sendPastedFile: fileHandling.sendPastedFile,
+    disableMessagePreprocessing,
   });
 
   if (fileHandling.pastedFile && !!isCellsEnabled) {
@@ -260,7 +280,7 @@
       return;
     }
 
     void sendMessage();
   }, [isSendingDisabled, sendMessage]);
 
   const showAvatar = !!messageContent.text.length;
@@ -281,7 +301,7 @@
         <div
           className={cx(`conversation-input-bar__input input-bar-container`, {
             [`conversation-input-bar__input--editing`]: isEditing,
-            'input-bar-container--with-toolbar': formatToolbar.open && showMarkdownPreview,
+            'input-bar-container--with-toolbar': formatToolbar.open && effectiveShowMarkdownPreview,
             'input-bar-container--with-files': !!files.length,
           })}
         >
@@ -303,7 +323,7 @@
                   editedMessage={editedMessage}
                   inputPlaceholder={inputPlaceholder}
                   hasLocalEphemeralTimer={hasLocalEphemeralTimer}
-                  showMarkdownPreview={showMarkdownPreview}
+                  showMarkdownPreview={effectiveShowMarkdownPreview}
                   formatToolbar={formatToolbar}
                   onSetup={editor => {
                     editorRef.current = editor;
@@ -321,6 +341,7 @@
                   getMentionCandidates={getMentionCandidates}
                   saveDraftState={draftState.save}
                   loadDraftState={draftState.load}
+                  disableMessagePreprocessing={disableMessagePreprocessing}
                   replaceEmojis={shouldReplaceEmoji}
                 >
                   {!!files.length && <FilePreviews files={files} conversationQualifiedId={conversation.qualifiedId} />}
@@ -332,7 +353,7 @@
                     messageContent={messageContent}
                     isEditing={isEditing}
                     isSendingDisabled={isSendingDisabled}
-                    showMarkdownPreview={showMarkdownPreview}
+                    showMarkdownPreview={effectiveShowMarkdownPreview}
                     showGiphyButton={giphy.showGiphyButton}
                     formatToolbar={formatToolbar}
                     emojiPicker={emojiPicker}

apps/webapp/src/script/components/InputBar/InputBarEditor/InputBarEditor.tsx

@@ -49,6 +49,7 @@ interface InputBarEditorProps {
   getMentionCandidates: (search?: string | null) => User[];
   saveDraftState: (editorState: string, plainMessage: string, replyId?: string) => void;
   loadDraftState: () => Promise<DraftState>;
+  disableMessagePreprocessing: boolean;
   replaceEmojis: boolean;
   children: React.ReactNode;
 }
@@ -70,6 +71,7 @@ export const InputBarEditor = ({
   getMentionCandidates,
   saveDraftState,
   loadDraftState,
+  disableMessagePreprocessing,
   replaceEmojis,
   children,
 }: InputBarEditorProps) => {
@@ -83,6 +85,7 @@ export const InputBarEditor = ({
       onEscape={onEscape}
       onArrowUp={onArrowUp}
       getMentionCandidates={getMentionCandidates}
+      disableMessagePreprocessing={disableMessagePreprocessing}
       replaceEmojis={replaceEmojis}
       placeholder={inputPlaceholder}
       onUpdate={onUpdate}

apps/webapp/src/script/components/InputBar/InputBarEditor/RichTextEditor/RichTextEditor.tsx

@@ -54,11 +54,12 @@ import {ListItemTabIndentationPlugin} from './plugins/ListIndentationPlugin/List
 import {ListMaxIndentLevelPlugin} from './plugins/ListMaxIndentLevelPlugin/ListMaxIndentLevelPlugin';
 import {MentionsPlugin} from './plugins/MentionsPlugin';
 import {PastePlugin} from './plugins/PastePlugin/PastePlugin';
+import {PlainTextPastePlugin} from './plugins/PlainTextPastePlugin';
 import {ReplaceCarriageReturnPlugin} from './plugins/ReplaceCarriageReturnPlugin/ReplaceCarriageReturnPlugin';
 import {SendPlugin} from './plugins/SendPlugin/SendPlugin';
 import {markdownTransformers} from './utils/markdownTransformers';
 import {parseMentions} from './utils/parseMentions';
-import {transformMessage} from './utils/transformMessage';
+import {getRawMessageText, transformMessage} from './utils/transformMessage';
 import {useEditorDraftState} from './utils/useEditorDraftState';
 
 interface RichTextEditorProps {
@@ -69,6 +70,7 @@ interface RichTextEditorProps {
   hasLocalEphemeralTimer: boolean;
   showFormatToolbar: boolean;
   showMarkdownPreview: boolean;
+  disableMessagePreprocessing: boolean;
   getMentionCandidates: (search?: string | null) => User[];
   saveDraftState: (editor: string, plainMessage: string, replyId?: string) => void;
   loadDraftState: () => Promise<DraftState>;
@@ -89,6 +91,7 @@ export const RichTextEditor = ({
   editedMessage,
   showFormatToolbar,
   showMarkdownPreview,
+  disableMessagePreprocessing,
   onUpdate,
   saveDraftState,
   loadDraftState,
@@ -108,6 +111,7 @@ export const RichTextEditor = ({
     editorRef,
     saveDraftState,
     replaceEmojis,
+    disableMessagePreprocessing,
   });
 
   const handleChange = (editorState: EditorState) => {
@@ -116,13 +120,14 @@ export const RichTextEditor = ({
         return;
       }
 
-      const markdown = $convertToMarkdownString(markdownTransformers, undefined, true);
-
-      const text = transformMessage({replaceEmojis, markdown});
+      const markdown = disableMessagePreprocessing
+        ? ''
+        : $convertToMarkdownString(markdownTransformers, undefined, true);
+      const text = disableMessagePreprocessing ? getRawMessageText() : transformMessage({replaceEmojis, markdown});
 
       onUpdate({
         text,
-        mentions: parseMentions(editorRef.current, markdown, getMentionCandidates()),
+        mentions: parseMentions(editorRef.current, text, getMentionCandidates()),
       });
 
       saveDraft();
@@ -145,11 +150,11 @@ export const RichTextEditor = ({
           />
           <DraftStatePlugin loadDraftState={loadDraftState} />
           <EditedMessagePlugin message={editedMessage} showMarkdownPreview={showMarkdownPreview} />
-          <EmojiPickerPlugin openStateRef={emojiPickerOpen} />
+          {!disableMessagePreprocessing && <EmojiPickerPlugin openStateRef={emojiPickerOpen} />}
           <HistoryPlugin />
 
-          {replaceEmojis && <ReplaceEmojiPlugin />}
-          <ReplaceCarriageReturnPlugin />
+          {replaceEmojis && !disableMessagePreprocessing && <ReplaceEmojiPlugin />}
+          {!disableMessagePreprocessing && <ReplaceCarriageReturnPlugin />}
 
           {showMarkdownPreview && (
             <>
@@ -177,12 +182,16 @@ export const RichTextEditor = ({
           <OnChangePlugin onChange={handleChange} ignoreSelectionChange />
           <SendPlugin
             onSend={() => {
-              if (!mentionsOpen.current && !emojiPickerOpen.current) {
+              if (!mentionsOpen.current && (disableMessagePreprocessing || !emojiPickerOpen.current)) {
                 onSend();
               }
             }}
           />
-          <PastePlugin getMentionCandidates={getMentionCandidates} isPreviewMode={showMarkdownPreview} />
+          {disableMessagePreprocessing ? (
+            <PlainTextPastePlugin />
+          ) : (
+            <PastePlugin getMentionCandidates={getMentionCandidates} isPreviewMode={showMarkdownPreview} />
+          )}
         </div>
       </div>
       {showFormatToolbar && showMarkdownPreview && (

apps/webapp/src/script/components/InputBar/InputBarEditor/RichTextEditor/plugins/PlainTextPastePlugin/PlainTextPastePlugin.tsx

@@ -0,0 +1,55 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {useCallback, useEffect} from 'react';
+
+import {useLexicalComposerContext} from '@lexical/react/LexicalComposerContext';
+import {$getSelection, $isRangeSelection, COMMAND_PRIORITY_HIGH, PASTE_COMMAND} from 'lexical';
+
+export const PlainTextPastePlugin = (): null => {
+  const [editor] = useLexicalComposerContext();
+
+  const handlePaste = useCallback(
+    (event: ClipboardEvent) => {
+      const plainText = event.clipboardData?.getData('text/plain');
+
+      if (plainText === undefined) {
+        return false;
+      }
+
+      editor.update(() => {
+        const selection = $getSelection();
+
+        if ($isRangeSelection(selection)) {
+          selection.insertText(plainText);
+        }
+      });
+
+      event.preventDefault();
+      return true;
+    },
+    [editor],
+  );
+
+  useEffect(() => {
+    return editor.registerCommand(PASTE_COMMAND, handlePaste, COMMAND_PRIORITY_HIGH);
+  }, [editor, handlePaste]);
+
+  return null;
+};

apps/webapp/src/script/components/InputBar/InputBarEditor/RichTextEditor/plugins/PlainTextPastePlugin/index.ts

@@ -0,0 +1,20 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+export * from './PlainTextPastePlugin';

apps/webapp/src/script/components/InputBar/InputBarEditor/RichTextEditor/utils/transformMessage.ts

@@ -17,8 +17,17 @@
  *
  */
 
+import {$getRoot} from 'lexical';
+
 import {findAndTransformEmoji} from '../plugins/InlineEmojiReplacementPlugin';
 
 export const transformMessage = ({replaceEmojis, markdown}: {replaceEmojis: boolean; markdown: string}) => {
   return replaceEmojis ? findAndTransformEmoji(markdown) : markdown;
 };
+
+export const getRawMessageText = () => {
+  return $getRoot()
+    .getChildren()
+    .map(node => node.getTextContent())
+    .join('\n');
+};