do not suggest to remove qualifier if fix would produce illegal forward ref (IDEA-87640)

plugins/InspectionGadgets/src/com/siyeh/ig/style/UnnecessarilyQualifiedStaticUsageInspection.java

@@ -191,12 +191,15 @@ public class UnnecessarilyQualifiedStaticUsageInspection
       final PsiMember member = (PsiMember)target;
       final PsiClass memberClass;
       if (target instanceof PsiField) {
-        final PsiVariable variable =
-          resolveHelper.resolveReferencedVariable(referenceName,
-                                                  referenceElement);
+        final PsiVariable variable = resolveHelper.resolveReferencedVariable(referenceName, referenceElement);
         if (variable == null || !variable.equals(member)) {
           return false;
         }
+
+        //illegal forward ref
+        if (referenceElement.getTextRange().getStartOffset() < variable.getTextRange().getEndOffset()) {
+          return false;
+        }
         final PsiMember memberVariable = (PsiMember)variable;
         memberClass = memberVariable.getContainingClass();
       }

plugins/InspectionGadgets/test/com/siyeh/igtest/style/unnecessarily_qualified_static_usage/UnnecessarilyQualifiedStaticUsageInspection.java

@@ -80,4 +80,9 @@ class InnerClassTest {
       System.out.println(InnerClassTest.foo);   // (2)
     }
   }
+}
+
+class ForwardRefTest {
+  private static final String FOO = ForwardRefTest.BAR;
+  private static final String BAR = "BAR";
 }