[apex] False positive ApexSharingViolationsRule, unsupported Apex feature

Fixes #1664

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/rule/security/ApexSharingViolationsRule.java

@@ -96,7 +96,8 @@ public class ApexSharingViolationsRule extends AbstractApexRule {
      * @return
      */
     private boolean isSharingPresent(ASTUserClass node) {
-        return node.getModifiers().isWithoutSharing() || node.getModifiers().isWithSharing();
+        return node.getModifiers().isWithoutSharing() || node.getModifiers().isWithSharing()
+                || node.getModifiers().isInheritedSharing();
     }
 
 }

pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/security/xml/ApexSharingViolations.xml

@@ -97,4 +97,15 @@ public without sharing class Foo {
 		]]></code>
 	</test-code>
 
+    <test-code>
+       <description>Apex class with inherited sharing doing a safe SOQL query</description>
+       <expected-problems>0</expected-problems>
+       <code><![CDATA[
+public inherited sharing class MyClass {
+   public List<Contact> getAllTheSecrets(){
+       return [SELECT Name FROM Contact];
+   }
+}
+     ]]></code>
+    </test-code>
 </test-data>