【修复】markdown渲染问题

@@ -108,10 +108,16 @@ class GptMarkdown extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     String tex = data.trim();
+    // print("texBefore:\n:$tex");
+
+    //去除 $$前面的空格 会导致渲染出错
     tex = tex.replaceAllMapped(
-      RegExp(r"(?<!\\)\$\$(.*?)(?<!\\)\$\$", dotAll: true),
-      (match) => "\\[${match[1] ?? ""}\\]",
+      RegExp(r"(?<!\\)\s*\$\$(.*?)(?<!\\)\$\$", dotAll: true),
+      (match) => "\n\\[${match[1] ?? ""}\\]",
     );
+
+    // print("texAfter:\n:$tex");
+
     if (!tex.contains(r"\(")) {
       tex = tex.replaceAllMapped(
         RegExp(r"(?<!\\)\$(.*?)(?<!\\)\$"),