Fix shift+ctrl+enter on system/assistant messages.

src/apps/chat/components/message/fragments-content/ContentFragments.tsx

@@ -70,6 +70,7 @@ export function ContentFragments(props: {
   const fromUser = props.messageRole === 'user';
   const isEditingText = !!props.textEditsState;
   // const isMonoFragment = props.fragments.length < 2;
+  const enableRestartFromEdit = !fromAssistant && props.messageRole !== 'system';
 
   // Content Fragments Edit Zero-State: button to create a new TextContentFragment
   if (isEditingText && !props.fragments.length)
@@ -115,7 +116,7 @@ export function ContentFragments(props: {
             textPartText={isTextPart(fragment.part) ? fragment.part.text : fragment.part.error}
             fragmentId={fragment.fId}
             contentScaling={props.contentScaling}
-            enableRestart={!fromAssistant}
+            enableRestart={enableRestartFromEdit}
             editedText={props.textEditsState[fragment.fId]}
             setEditedText={props.setEditedText}
             onSubmit={props.onEditsApply}

src/apps/chat/components/message/fragments-content/TextFragmentEditor.tsx

@@ -71,13 +71,14 @@ export function TextFragmentEditor(props: {
       const withControl = e.ctrlKey;
       if (enterIsNewline ? shiftOrAlt : !shiftOrAlt) {
         e.preventDefault();
-        onSubmit(withControl);
+        if (!withControl || props.enableRestart)
+          onSubmit(withControl);
       }
     } else if (e.key === 'Escape') {
       e.preventDefault();
       onEscapePressed();
     }
-  }, [enterIsNewline, onSubmit, onEscapePressed]);
+  }, [enterIsNewline, props.enableRestart, onSubmit, onEscapePressed]);
 
   // shortcuts
   const isEdited = props.editedText !== undefined;