Java: Don't offer the quick-fix Collection.toArray() for type parameter arrays (like T[]) (IDEA-163341)

java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightUtil.java

@@ -651,6 +651,7 @@ public class HighlightUtil extends HighlightUtilBase {
     if (toType instanceof PsiArrayType) {
       PsiType arrayComponentType = ((PsiArrayType)toType).getComponentType();
       if (!(arrayComponentType instanceof PsiPrimitiveType) &&
+          !(PsiUtil.resolveClassInType(arrayComponentType) instanceof PsiTypeParameter) &&
           InheritanceUtil.isInheritor(fromType, CommonClassNames.JAVA_UTIL_COLLECTION)) {
         PsiType collectionItemType = JavaGenericsUtil.getCollectionItemType(fromType, expression.getResolveScope());
         if (collectionItemType != null && arrayComponentType.isAssignableFrom(collectionItemType)) {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/convertCollectionToArray/beforeTypeVar.java

@@ -0,0 +1,10 @@
+// "Apply conversion '.toArray(new T[0])'" "false"
+
+import java.util.*;
+class TypeVar<T> {
+  T[] foo() {
+    Set<T> set = new HashSet<>();
+    T[] arr = <caret>set;
+    return arr;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/convertCollectionToArray/beforeTypeVarArray.java

@@ -0,0 +1,10 @@
+// "Apply conversion '.toArray(new T[0][])'" "false"
+
+import java.util.*;
+class TypeVarArray<T> {
+  T[][] foo() {
+    Set<T[]> set = new HashSet<>();
+    T[][] arr = <caret>set;
+    return arr;
+  }
+}