[prakashNalla]

What does this change?

renderMarkdown() matched a code block's language tag with \w*, so a tag with a symbol (c++, c#, objective-c) left the rest of the tag at the top of the block, and a one-line block like ```const x``` lost its first word as if it were the tag. The tag is now anything up to the end of the fence line, and only when a newline follows it. Patch changeset for @chatcops/widget.

Closes #578

How I tested this

Added cases to packages/widget/tests/markdown.test.ts for c++, c#, objective-c and ts tags and for a one-line block. The first three and the one-line case fail without the change. I also added a tag with a space after it (```ts) and a block that is still streaming with no closing fence; both render the same as on dev.

• pnpm -r build and pnpm -r typecheck: pass
• pnpm test: 2430 tests passed (65 skipped)
• pnpm lint: passes
• pnpm size: all bundles still under their limits, the chat panel is 18.89 of 19 kB

AI assistance

Claude helped me w/ understand the issue

Checklist

• This PR targets dev
• I was assigned the linked issue
• pnpm -r build, pnpm test and pnpm -r typecheck pass locally
• Tests added or updated where it makes sense
• For a bug fix: the new test fails without my change
• Changeset added (pnpm changeset) if this changes core, widget or server
• Docs updated if behavior or options changed

[anurag629]

Thanks @prakashNalla, the change is right. The new pattern at packages/widget/src/markdown.ts:45 takes everything up to the first newline as the tag, and only when a newline follows, so a c++, c# or objective-c tag is dropped whole and a one-line block keeps its first word. The tests cover each case from #578, and the tag with a space after it and the unclosed block expect the same output dev gives today.

[anurag629]

Merged, thanks @prakashNalla.