{@code} inline tag is not rendered correctly in Markdown hover

This PR fixes an issue where the {@code} inline tag is not rendered
correctly in the Markdown hover. It also addresses incorrect handling of
the {@literal} tag, which is included as part of the same issue.

Fix: #3672

Author: subyssurendran666

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/javadoc/JavadocContentAccess2.java

@@ -168,6 +168,8 @@ private static void collectTagElements(String content, IJavaElement element, Tag
 			if (e instanceof TagElement t) {
 				if ("@link".equals(t.getTagName()) || "@linkplain".equals(t.getTagName())) {
 					collectLinkedTag(element, t, buf);
+				} else if ("@code".equals(t.getTagName()) || "@literal".equals(t.getTagName())) {
+					collectCodeAndLiteralTag(element, t, buf);
 				} else {
 					collectTagElements(content, element, t, buf);
 				}
@@ -195,6 +197,25 @@ private static void collectTagElements(String content, IJavaElement element, Tag
 		}
 	}
 
+	private static void collectCodeAndLiteralTag(IJavaElement element, TagElement t, StringBuilder buf) {
+		if (t.fragments().size() > 0) {
+			try {
+				if (t.fragments().size() == 1) {
+					String code = ((TextElement) t.fragments().get(0)).getText();
+					if ("@code".equals(t.getTagName())) {
+						buf.append("`" + code + "`");
+					} else if ("@literal".equals(t.getTagName())) {
+						// escape chars applied for <>*^&\`[]
+						code = code.replaceAll("([<>*^&\\\\`\\[\\]])", "\\\\$1");
+						buf.append(code);
+					}
+				}
+			} catch (Exception e) {
+				JavaManipulationPlugin.log(e);
+			}
+		}
+	}
+
 	private static void collectLinkedTag(IJavaElement element, TagElement t, StringBuilder buf) {
 		@SuppressWarnings("unchecked")
 		List<IDocElement> children = t.fragments();

org.eclipse.jdt.ls.tests/src/org/eclipse/jdt/ls/core/internal/handlers/HoverHandlerTest.java

@@ -1050,4 +1050,58 @@ public class Meh {}
 		actual = ResourceUtils.dos2Unix(actual);
 		assertEquals(expectedJavadoc, actual, "Unexpected hover ");
 	}
+
+	@Test
+	public void testHoverMarkdownWithCodeTag_01() throws Exception {
+		String name = "java25";
+		importProjects("eclipse/" + name);
+		IProject project = getProject(name);
+		IJavaProject javaProject = JavaCore.create(project);
+		IPackageFragmentRoot packageFragmentRoot = javaProject.getPackageFragmentRoot(project.getFolder("src/main/java"));
+		IPackageFragment pack1 = packageFragmentRoot.createPackageFragment("test", false, null);
+		StringBuilder buf = new StringBuilder();
+		//@formatter:off
+		buf.append("package test;\n"
+				+ "/// {@code List<String>}\n"
+				+ "public class Markdown{}\n");
+		//@formatter:on
+		ICompilationUnit cu = pack1.createCompilationUnit("Test.java", buf.toString(), false, null);
+		Hover hover = getHover(cu, 2, 14);
+		assertNotNull(hover);
+		assertEquals(2, hover.getContents().getLeft().size());
+		StringBuilder expectedJavadoc = new StringBuilder();
+		//@formatter:off
+		expectedJavadoc.append("` List<String>` ");
+		//@formatter:on
+		String actual = hover.getContents().getLeft().get(1).getLeft();
+		actual = ResourceUtils.dos2Unix(actual);
+		assertEquals(expectedJavadoc.toString(), actual, "Unexpected hover ");
+	}
+
+	@Test
+	public void testHoverMarkdownWithCodeTag_02() throws Exception {
+		String name = "java25";
+		importProjects("eclipse/" + name);
+		IProject project = getProject(name);
+		IJavaProject javaProject = JavaCore.create(project);
+		IPackageFragmentRoot packageFragmentRoot = javaProject.getPackageFragmentRoot(project.getFolder("src/main/java"));
+		IPackageFragment pack1 = packageFragmentRoot.createPackageFragment("test", false, null);
+		StringBuilder buf = new StringBuilder();
+		//@formatter:off
+		buf.append("package test;\n"
+				+ "/// {@literal List<String> <>*^&`[]}\n"
+				+ "public class Markdown{}\n");
+		//@formatter:on
+		ICompilationUnit cu = pack1.createCompilationUnit("Test.java", buf.toString(), false, null);
+		Hover hover = getHover(cu, 2, 14);
+		assertNotNull(hover);
+		assertEquals(2, hover.getContents().getLeft().size());
+		StringBuilder expectedJavadoc = new StringBuilder();
+		//@formatter:off
+		expectedJavadoc.append(" List\\<String\\> \\<\\>\\*\\^\\&\\`\\[\\] ");
+		//@formatter:on
+		String actual = hover.getContents().getLeft().get(1).getLeft();
+		actual = ResourceUtils.dos2Unix(actual);
+		assertEquals(expectedJavadoc.toString(), actual, "Unexpected hover ");
+	}
 }