No errors for fetch param in git resource

headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java

@@ -417,6 +417,7 @@ public class PipelineYmlSchema implements YamlSchema {
 			addProp(get, "depth", t_pos_integer);
 			addProp(get, "submodules", f.yany("GitSubmodules").addHints("all", "none"));
 			addProp(get, "disable_git_lfs", t_boolean);
+			addProp(get, "fetch", t_strings); //Warning: t_strings is just a guess. This property is undocumented. The example I've seen seem to use list of git branch/tag names.
 
 			AbstractType put = f.ybean("GitPutParams");
 			addProp(put, "repository", t_ne_string).isPrimary(true);

headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java

@@ -1133,6 +1133,9 @@ public class ConcourseEditorTest {
 				,
 				"disable_git_lfs: <*>"
 				,
+				"fetch:\n" +
+				"      - <*>"
+				,
 				"submodules:\n"+
 				"        <*>"
 		);
@@ -3739,6 +3742,28 @@ public class ConcourseEditorTest {
 		);
 	}
 
+	@Test public void gitResourceFetchParameter() throws Exception {
+		Editor editor = harness.newEditor(
+				"resources:\n" +
+				"  - name: cf-networking-dev\n" +
+				"    type: git\n" +
+				"    source:\n" +
+				"      uri: git@github.com:cloudfoundry-incubator/cf-networking-release.git\n" +
+				"      branch: develop\n" +
+				"      ignore_paths:\n" +
+				"        - docs\n" +
+				"      private_key: {{cf-networking-deploy-key}}\n" +
+				"jobs:\n" +
+				"- name: foo\n" +
+				"  plan:\n" +
+				"  - get: cf-networking-dev\n" +
+				"    params:\n" +
+				"      fetch: [master]\n" +
+				"      submodules: none\n"
+		);
+		editor.assertProblems(/*NONE*/);
+	}
+
 	//////////////////////////////////////////////////////////////////////////////
 
 	private void assertContextualCompletions(String conText, String textBefore, String... textAfter) throws Exception {