bugfix: Not show project node for non-java project (#245)

Signed-off-by: Sheng Chen <[email protected]>

Author: jdneo

jdtls.ext/com.microsoft.jdtls.ext.core/src/com/microsoft/jdtls/ext/core/ProjectCommand.java

@@ -42,6 +42,9 @@ public static List<PackageNode> listProjects(List<Object> arguments, IProgressMo
         ArrayList<PackageNode> children = new ArrayList<>();
         List<IPath> paths = Arrays.asList(workspacePath);
         for (IProject project : projects) {
+            if (!ProjectUtils.isJavaProject(project)) {
+                continue;
+            }
             if (project.exists() && (ResourceUtils.isContainedIn(project.getLocation(), paths) || Objects.equals(project.getName(), invisibleProjectName))) {
                 PackageNode projectNode = new PackageNode(project.getName(), project.getFullPath().toPortableString(), NodeKind.PROJECT);
                 projectNode.setUri(project.getLocationURI().toString());