it doesn't show all the [variableScope] warnings

[ZenWalker]

In the file attached:

-------------------------------------------------------------------------------------------------------
$ cppcheck --enable=all testcppcheck.c
Checking testcppcheck.c ...
testcppcheck.c:5:14: style: The scope of the variable 'content_area' can
be reduced. [variableScope]
  CtkWidget *content_area;
             ^
testcppcheck.c:6:14: style: The scope of the variable 'hbox' can be
reduced. [variableScope]
  CtkWidget *hbox;
             ^
testcppcheck.c:7:14: style: The scope of the variable 'drawing_area' can
be reduced. [variableScope]
  CtkWidget *drawing_area;
             ^
testcppcheck.c:8:14: style: The scope of the variable 'scrollbar' can be
reduced. [variableScope]
  CtkWidget *scrollbar;
             ^
testcppcheck.c:9:18: style: The scope of the variable 'adjustment' can
be reduced. [variableScope]
  CtkAdjustment *adjustment;
                 ^
testcppcheck.c:2:0: style: The function 'create_scroll_test' is never
used. [unusedFunction]

^
---------------------------------------------------------------------------------------------------

There are more variables which can be reduced, 'geometry' and
'geometry_mask', but cppcheck doesn't show the warnings.