[Markdown] Snippet tag failed to generate javadoc

[subyssurendran666]

The @snippet tag content was not being rendered in the Javadoc view because plain snippet text was not captured during parsing. This change ensures snippet content is properly extracted and displayed, similar to standard Javadoc elements.

Fix: #4968

What it does

How to test

Scenario

/// {@snippet :
/// var s = "";
/// 	int x = 2;
/// String name = "eclipse";
/// }

Author checklist

• I have thoroughly tested my changes
• The change is following the coding conventions
• I have signed the Eclipse Contributor Agreement (ECA)

[Copilot]

Pull request overview

Fixes Markdown doc comment parsing so {@snippet ...} content (especially plain inlined snippet text) is extracted and can be rendered in the Javadoc view (Issue #4968).

Changes:

• Update the compiler’s comment parser to capture Markdown snippet text and adjust snippet validity handling.
• Add Markdown-focused regression tests for @snippet tags.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTConverterMarkdownTest.java	Adds new Markdown snippet parsing tests.
org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/internal/compiler/parser/AbstractCommentParser.java	Adjusts snippet parsing to capture Markdown snippet content and set snippet validity.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[jarthana]

@subyssurendran666 Are you planning to address the review comments raised by CoPilot? Please disable it otherwise. There's just too much information here.

[subyssurendran666]

@subyssurendran666 Are you planning to address the review comments raised by CoPilot? Please disable it otherwise. There's just too much information here.

I have addressed the problems addressed by the co-pilot and added necessary comments.