[Bug dap/30821] New: "this" have no children. It comes with "variablesReference" 0.

["artem.sokolovskii at qt dot io" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30821

            Bug ID: 30821
           Summary: "this" have no children. It comes with
                    "variablesReference" 0.
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dap
          Assignee: unassigned at sourceware dot org
          Reporter: artem.sokolovskii at qt dot io
  Target Milestone: ---

I request variables for scope and get "this" in the list but it has
variablesReference = 0. It means that the variable has no children.
https://microsoft.github.io/debug-adapter-protocol/specification#Types_Variable
I have a simple class and I should see "i" variable as a child of "this". At
least I see it like this in not DAP GDB version.

class myClass
{
public:
   void increment()
   {
      ++i;
   }

private:
   int i = 0;
};

Log:
qtc.dbg.dapengine: dap response
QJsonObject({"body":{"variables":[{"name":"this","value":"0x7fffffffda40","variablesReference":0},{"name":"i","value":"0","variablesReference":0}]},"command":"variables","request_seq":29,"seq":208,"success":true,"type":"response"})

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