C++: Fix explicit this-> FP.

cpp/ql/src/Best Practices/Likely Errors/CommaBeforeMisleadingIndentation.ql

@@ -13,10 +13,10 @@ import semmle.code.cpp.commons.Exclusions
 
 /** Gets the sub-expression of 'e' with the earliest-starting Location */
 Expr normalizeExpr(Expr e) {
-  if forex(Expr q | q = e.(Call).getQualifier() | not q instanceof ThisExpr)
+  if forex(Expr q | q = e.(Call).getQualifier() | not q.(ThisExpr).isCompilerGenerated())
   then result = normalizeExpr(e.(Call).getQualifier())
   else
-    if forex(Expr q | q = e.(FieldAccess).getQualifier() | not q instanceof ThisExpr)
+    if forex(Expr q | q = e.(FieldAccess).getQualifier() | not q.(ThisExpr).isCompilerGenerated())
     then result = normalizeExpr(e.(FieldAccess).getQualifier())
     else
       if e.hasExplicitConversion()

cpp/ql/test/query-tests/Best Practices/Likely Errors/CommaBeforeMisleadingIndentation/test.cpp

@@ -40,6 +40,10 @@ int Foo::test(int (*baz)(int))
 		(void)i,	// GOOD
 		(void)j;
 
+	if (i)
+		this->foo(i),	// GOOD
+		foo(i);
+
 	if (i)
 		(void)i,	// BAD
 	(void)j;