Fix regression in resolving references with using statements.

Author: m0rkeulv

src/main/java/com/intellij/plugins/haxe/model/HaxeFileModel.java

@@ -94,6 +94,16 @@ public List<HaxeModel> getExposedMembers() {
 
     return  publicModels;
   }
+  @NotNull
+  public List<HaxeModel> getModuleMembers() {
+    List<HaxeModel> publicModels = new ArrayList<>();
+
+    HaxeModule module = getModuleBody();
+    if(module != null && module.getModel() instanceof HaxeModuleModel model){
+      publicModels.addAll(model.getExposedMembers());
+    }
+    return  publicModels;
+  }
 
   @Nullable
   public HaxeClassModel getMainClassModel() {

src/main/java/com/intellij/plugins/haxe/model/HaxeImportableModel.java

@@ -50,14 +50,17 @@ public FullyQualifiedInfo getQualifiedInfo() {
 
   @NotNull
   public List<HaxeModel> getExposedMembersInternal() {
+    boolean isUsing = this instanceof HaxeUsingModel; // TODO should probably  do thins in a different way
     FullyQualifiedInfo qualifiedInfo = getQualifiedInfo();
     List<HaxeModel> result;
     result = HaxeProjectModel.fromElement(basePsi).resolve(qualifiedInfo, basePsi.getResolveScope());
     if (result != null && !result.isEmpty()) {
       HaxeModel firstItem = result.getFirst();
-      if (firstItem instanceof HaxeFileModel || firstItem instanceof HaxePackageModel) {
-        result = ((HaxeExposableModel)firstItem).getExposedMembers();
-      }
+        if (firstItem instanceof HaxeFileModel fileModel) {
+            result = isUsing ? fileModel.getModuleMembers() : fileModel.getExposedMembers();
+        } else if (firstItem instanceof HaxePackageModel packageModel) {
+            result = packageModel.getExposedMembers();
+        }
     }
     return result == null ? Collections.emptyList() : result;
   }

src/test/java/com/intellij/plugins/haxe/resolve/HaxeModuleTest.java

@@ -33,8 +33,9 @@ public void testModuleImport() {
         doTest(
                 "modules/ModuleWithMainClass.hx",
                 "modules/ModuleWithoutMainClass.hx",
-                "other/OtherModule.hx"
-        );
+                "other/OtherModule.hx",
+                "umods/UsingModule.hx"
+                );
     }
 
 }

src/test/resources/testData/resolve/modules/ModuleImport.hx

@@ -1,6 +1,7 @@
 package ;
 import modules.* ;
 import other.OtherModule;
+using <info descr="null">umods.UsingModule</info>;
 
 class <info descr="null">ModuleImportTest</info> {
     public function <info descr="null">new</info>() {
@@ -19,6 +20,11 @@ class <info descr="null">ModuleImportTest</info> {
         ModuleWithMainClass.<info descr="null">moduleField</info>;
         ModuleWithoutMainClass.<info descr="null">moduleProperty</info>;
 
+        // verify using on module  return all types
+        var <info descr="null">usingImportsTypedef</info>:<info descr="null">MyTypeDef</info>;
+        var <info descr="null">usingImportsSub</info>:<info descr="null">SomeClassUsing</info>;
+        var <info descr="null">usingImportsMain</info>:<info descr="null">UsingModule</info>;
+
 
         // should resolve
         var <info descr="null">instance1</info>:<info descr="null">ModuleWithMainClass.SomeModuleClass</info> =  <info descr="null">new</info> <info descr="null">ModuleWithMainClass.SomeModuleClass</info>();

src/test/resources/testData/resolve/modules/umods/UsingModule.hx

@@ -0,0 +1,7 @@
+package umods;
+
+typedef MyTypeDef = String;
+
+class SomeClassUsing {}
+
+class UsingModule {}