fix(file-manager): restore text selection and copying in Markdown previews (#1518)

plugins/file-manager/src/frontend/components/MarkdownRenderer.tsx

@@ -48,75 +48,87 @@ export function MarkdownRenderer({
     : "px-4 py-2 text-foreground";
 
   return (
-    <ReactMarkdown
-      remarkPlugins={[remarkGfm]}
-      components={{
-        code({ className, children, ...props }) {
-          const match = /language-(\w+)/.exec(className || "");
-          // v9 removed the `inline` flag; a fenced block always carries a
-          // language- class, an inline span never does.
-          const inline = !className;
-          return !inline && match ? (
-            <SyntaxHighlighter
-              style={syntaxTheme}
-              language={match[1]}
-              PreTag="div"
-              className="rounded-lg"
-              {...props}
-            >
-              {String(children).replace(/\n$/, "")}
-            </SyntaxHighlighter>
-          ) : (
-            <code
-              className="bg-muted px-1 py-0.5 rounded text-sm font-mono"
-              {...props}
-            >
-              {children}
-            </code>
-          );
-        },
-        h1: ({ children }) => <h1 className={h1Class}>{children}</h1>,
-        h2: ({ children }) => <h2 className={h2Class}>{children}</h2>,
-        h3: ({ children }) => <h3 className={h3Class}>{children}</h3>,
-        h4: ({ children }) => <h4 className={h4Class}>{children}</h4>,
-        p: ({ children }) => <p className={pClass}>{children}</p>,
-        ul: ({ children }) => (
-          <ul className={`${listClass} list-disc`}>{children}</ul>
-        ),
-        ol: ({ children }) => (
-          <ol className={`${listClass} list-decimal`}>{children}</ol>
-        ),
-        li: ({ children }) => (
-          <li className="mb-1 text-foreground">{children}</li>
-        ),
-        blockquote: ({ children }) => (
-          <blockquote className={quoteClass}>{children}</blockquote>
-        ),
-        table: ({ children }) => (
-          <div className={tableWrapClass}>
-            <table className={tableClass}>{children}</table>
-          </div>
-        ),
-        thead: ({ children }) => <thead className="bg-muted">{children}</thead>,
-        tbody: ({ children }) => <tbody>{children}</tbody>,
-        tr: ({ children }) => (
-          <tr className="border-b border-border">{children}</tr>
-        ),
-        th: ({ children }) => <th className={thClass}>{children}</th>,
-        td: ({ children }) => <td className={tdClass}>{children}</td>,
-        a: ({ href, children }) => (
-          <a
-            href={href}
-            target="_blank"
-            rel="noopener noreferrer"
-            className="text-blue-600 hover:text-blue-800 underline"
-          >
-            {children}
-          </a>
-        ),
+    <div
+      className="select-text"
+      tabIndex={0}
+      onKeyDown={(event) => {
+        // Keep native text copying out of the file grid's global shortcuts.
+        if ((event.ctrlKey || event.metaKey) && event.key.toLowerCase() === "c")
+          event.stopPropagation();
       }}
     >
-      {content}
-    </ReactMarkdown>
+      <ReactMarkdown
+        remarkPlugins={[remarkGfm]}
+        components={{
+          code({ className, children, ...props }) {
+            const match = /language-(\w+)/.exec(className || "");
+            // v9 removed the `inline` flag; a fenced block always carries a
+            // language- class, an inline span never does.
+            const inline = !className;
+            return !inline && match ? (
+              <SyntaxHighlighter
+                style={syntaxTheme}
+                language={match[1]}
+                PreTag="div"
+                className="rounded-lg"
+                {...props}
+              >
+                {String(children).replace(/\n$/, "")}
+              </SyntaxHighlighter>
+            ) : (
+              <code
+                className="bg-muted px-1 py-0.5 rounded text-sm font-mono"
+                {...props}
+              >
+                {children}
+              </code>
+            );
+          },
+          h1: ({ children }) => <h1 className={h1Class}>{children}</h1>,
+          h2: ({ children }) => <h2 className={h2Class}>{children}</h2>,
+          h3: ({ children }) => <h3 className={h3Class}>{children}</h3>,
+          h4: ({ children }) => <h4 className={h4Class}>{children}</h4>,
+          p: ({ children }) => <p className={pClass}>{children}</p>,
+          ul: ({ children }) => (
+            <ul className={`${listClass} list-disc`}>{children}</ul>
+          ),
+          ol: ({ children }) => (
+            <ol className={`${listClass} list-decimal`}>{children}</ol>
+          ),
+          li: ({ children }) => (
+            <li className="mb-1 text-foreground">{children}</li>
+          ),
+          blockquote: ({ children }) => (
+            <blockquote className={quoteClass}>{children}</blockquote>
+          ),
+          table: ({ children }) => (
+            <div className={tableWrapClass}>
+              <table className={tableClass}>{children}</table>
+            </div>
+          ),
+          thead: ({ children }) => (
+            <thead className="bg-muted">{children}</thead>
+          ),
+          tbody: ({ children }) => <tbody>{children}</tbody>,
+          tr: ({ children }) => (
+            <tr className="border-b border-border">{children}</tr>
+          ),
+          th: ({ children }) => <th className={thClass}>{children}</th>,
+          td: ({ children }) => <td className={tdClass}>{children}</td>,
+          a: ({ href, children }) => (
+            <a
+              href={href}
+              target="_blank"
+              rel="noopener noreferrer"
+              className="text-blue-600 hover:text-blue-800 underline"
+            >
+              {children}
+            </a>
+          ),
+        }}
+      >
+        {content}
+      </ReactMarkdown>
+    </div>
   );
 }

plugins/file-manager/tests/frontend/components/MarkdownRenderer.test.tsx

@@ -0,0 +1,43 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import "@testing-library/jest-dom/vitest";
+import { MarkdownRenderer } from "../../../src/frontend/components/MarkdownRenderer";
+
+afterEach(cleanup);
+
+describe("Markdown preview text copying", () => {
+  it.each([false, true])(
+    "supports copying in compact=%s previews",
+    (compact) => {
+      const fileShortcut = vi.fn();
+      document.addEventListener("keydown", fileShortcut);
+      try {
+        const { container } = render(
+          <div className="select-none">
+            <MarkdownRenderer
+              compact={compact}
+              content={"# Preview\n\nCopy this text."}
+            />
+          </div>,
+        );
+        const preview = container.querySelector<HTMLElement>(".select-text")!;
+        preview.focus();
+        expect(preview).toHaveFocus();
+        expect(
+          screen.getByRole("heading", { name: "Preview" }),
+        ).toBeInTheDocument();
+        for (const modifier of [{ ctrlKey: true }, { metaKey: true }]) {
+          expect(fireEvent.keyDown(preview, { key: "c", ...modifier })).toBe(
+            true,
+          );
+        }
+        expect(fileShortcut).not.toHaveBeenCalled();
+        fireEvent.keyDown(preview, { key: "Escape" });
+        expect(fileShortcut).toHaveBeenCalledTimes(1);
+        expect(fireEvent.contextMenu(preview)).toBe(true);
+      } finally {
+        document.removeEventListener("keydown", fileShortcut);
+      }
+    },
+  );
+});