Merge pull request #98 from arlampin/issue-93-find-usages-dialog

Fix 'Find Usages' dialog for non-GraphQL entities. Fixes #93

Author: jimkyndemeyer

src/main/com/intellij/lang/jsgraphql/endpoint/ide/findUsages/JSGraphQLEndpointFindUsagesHandlerFactory.java

@@ -7,13 +7,13 @@
  */
 package com.intellij.lang.jsgraphql.endpoint.ide.findUsages;
 
+import com.intellij.lang.jsgraphql.endpoint.psi.JSGraphQLEndpointPsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import com.intellij.find.findUsages.FindUsagesHandler;
 import com.intellij.find.findUsages.FindUsagesHandlerFactory;
 import com.intellij.psi.PsiElement;
-import com.intellij.psi.PsiNamedElement;
 
 /**
  * Find usages handler factory for the GraphQL Endpoint language
@@ -25,7 +25,7 @@ public boolean canFindUsages(@NotNull PsiElement element) {
         if(!element.isValid()) {
             return false;
         }
-        return element instanceof PsiNamedElement;
+        return element instanceof JSGraphQLEndpointPsiElement;
     }
 
     @Nullable