fix(frontend): preserve single tildes in markdown (#4245)

frontend/src/core/streamdown/plugins.ts

@@ -12,11 +12,13 @@ const katexOptions = {
   strict: false,
 } as const;
 
+const sharedRemarkPlugins = [
+  [remarkGfm, { singleTilde: false }],
+  [remarkMath, { singleDollarTextMath: true }],
+] as StreamdownProps["remarkPlugins"];
+
 export const streamdownPlugins = {
-  remarkPlugins: [
-    remarkGfm,
-    [remarkMath, { singleDollarTextMath: true }],
-  ] as StreamdownProps["remarkPlugins"],
+  remarkPlugins: sharedRemarkPlugins,
   rehypePlugins: [
     rehypeRaw,
     [rehypeKatex, katexOptions],
@@ -24,10 +26,7 @@ export const streamdownPlugins = {
 };
 
 export const streamdownPluginsWithWordAnimation = {
-  remarkPlugins: [
-    remarkGfm,
-    [remarkMath, { singleDollarTextMath: true }],
-  ] as StreamdownProps["remarkPlugins"],
+  remarkPlugins: sharedRemarkPlugins,
   rehypePlugins: [
     [rehypeKatex, katexOptions],
     rehypeSplitWordsIntoSpans,

frontend/tests/unit/components/workspace/messages/markdown-content.test.ts

@@ -83,3 +83,18 @@ describe("MarkdownContent streaming code blocks", () => {
     expect(html).toContain("data-streaming-code-block");
   });
 });
+
+describe("MarkdownContent strikethrough", () => {
+  it("preserves single tildes in temperature ranges", () => {
+    const html = renderMarkdown("周六23~30℃；周日22~30℃", false);
+
+    expect(html).toContain("周六23~30℃；周日22~30℃");
+    expect(html).not.toContain("<del>");
+  });
+
+  it("continues to render double-tilde strikethrough", () => {
+    const html = renderMarkdown("状态：~~已取消~~", false);
+
+    expect(html).toContain("<del>已取消</del>");
+  });
+});

frontend/tests/unit/core/streamdown/plugins.test.ts

@@ -1,7 +1,21 @@
 import { expect, test } from "@rstest/core";
 import rehypeRaw from "rehype-raw";
+import remarkGfm from "remark-gfm";
 
-import { reasoningPlugins, streamdownPlugins } from "@/core/streamdown/plugins";
+import {
+  reasoningPlugins,
+  streamdownPlugins,
+  streamdownPluginsWithWordAnimation,
+} from "@/core/streamdown/plugins";
+
+test("shared streamdown configs disable single-tilde strikethrough", () => {
+  const expectedGfmPlugin = [remarkGfm, { singleTilde: false }];
+
+  expect(streamdownPlugins.remarkPlugins).toContainEqual(expectedGfmPlugin);
+  expect(streamdownPluginsWithWordAnimation.remarkPlugins).toContainEqual(
+    expectedGfmPlugin,
+  );
+});
 
 test("streamdownPlugins includes rehypeRaw", () => {
   expect(streamdownPlugins.rehypePlugins).toContain(rehypeRaw);