Fix: Linkify markdown links with no space before [ when link text contains spaces

[tamuratak]

Close #318866

Fix: Linkify markdown links with no space before [ when link text contains spaces

When a markdown link is immediately preceded by text (e.g. abc[src/main.ts 17](src/main.ts#L17)), the Linkifier's whitespace-based tokenization splits the input such that the [ never lands at the start of a token, preventing the state machine from entering PotentialLink mode. This fix detects an unclosed [ within accumulated Word state tokens, splits the text at the bracket, linkifies the prefix as a normal word, and transitions the remainder into PotentialLink state.

Created with GitHub Copilot + MiMO-V2.5-Pro

CC: @vijayupadya @justschen

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds handling in the stateful linkifier for markdown links that are immediately preceded by text without an intervening space (e.g. abc[file.ts](file.ts)), so the preceding text is emitted as its own part and the link is still detected.

Changes:

• When accumulating a Word and whitespace is encountered, detect an unclosed [ inside the accumulated text and split the buffer into a preceding text portion plus a PotentialLink starting at [.
• Add tests covering both single-token and incrementally-streamed inputs with markdown links preceded by text.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
extensions/copilot/src/extension/linkify/common/linkifier.ts	Splits accumulated word at [ to start a PotentialLink state when the bracket is unclosed.
extensions/copilot/src/extension/linkify/test/node/linkifier.spec.ts	Adds tests for markdown links preceded by text, in both single and split-token scenarios.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.