fix slate case of #7563 -- @mentions are too aggressive

Author: williamstein

src/packages/frontend/editors/slate/slate-mentions/hook.ts

@@ -94,7 +94,9 @@ export const useMentions: (Options) => MentionsControl = ({
           }
           if (Text.isText(current)) {
             const charBeforeCursor = current.text[focus.offset - 1];
+            const charBeforeBefore = current.text[focus.offset - 2]?.trim();
             let afterMatch, beforeMatch, beforeRange, search;
+            // try to keep this consistent with before stuff in frontend/editors/markdown-input/component.tsx
             if (charBeforeCursor == "@") {
               beforeRange = {
                 focus: editor.selection.focus,
@@ -118,7 +120,12 @@ export const useMentions: (Options) => MentionsControl = ({
               const afterText = Editor.string(editor, afterRange);
               afterMatch = afterText.match(/^(\s|$)/);
             }
-            if (charBeforeCursor == "@" || (beforeMatch && afterMatch)) {
+            if (
+              (charBeforeCursor == "@" || (beforeMatch && afterMatch)) &&
+              (!charBeforeBefore ||
+                charBeforeBefore == "(" ||
+                charBeforeBefore == "[")
+            ) {
               setTarget(beforeRange);
               setSearch(search);
               return;