[clazy] [Bug 386134] New: Add qgraphicsitem_cast check.

[Roman]

https://bugs.kde.org/show_bug.cgi?id=386134

            Bug ID: 386134
           Summary: Add qgraphicsitem_cast check.
           Product: clazy
           Version: unspecified
          Platform: Other
                OS: All
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: dismine at gmail.com
                CC: smartins at kde.org
  Target Milestone: ---

Hi, i want to propose new check. Recently i worked with QGraphicsItem and
wanted to cast a pointer. Because i use Qt i prefer to use it's cast functions,
for example qobject_cast. But somehow qgraphicsitem_cast did not work as i
expected it should be for "_cast" function. My first guess was to reimplement
the type() function as mentioned in documentation. But this did not help me
too. Then after some time i figured out that qgraphicsitem_cast can only cast
from QGraphicsItem pointer to real object type, you can't get nothing on
"middle" of hierarchy with it. And i was trying to get item's parent. My
mistake.

To sum up thoughts i propose check if the type() reimplemented for item used
with qgraphicsitem_cast. Without it it will not work. And also check if
developer doesn't try to cast on "middle". This will also doesn't work.

Yes, this is stupid mistake i did, but for someone such a check can potentially
save several hours. Hope you will like my idea.

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