TGraph:SetNameTitle did not change the title of the underlying histogram.

This was reported here: https://sft.its.cern.ch/jira/browse/ROOT-9222

Author: couet

hist/hist/inc/TGraph.h

@@ -170,6 +170,8 @@ class TGraph : public TNamed, public TAttLine, public TAttFill, public TAttMarke
    virtual void          SetMinimum(Double_t minimum=-1111); // *MENU*
    virtual void          Set(Int_t n);
    virtual void          SetPoint(Int_t i, Double_t x, Double_t y);
+   virtual void          SetName(const char *name=""); // *MENU*
+   virtual void          SetNameTitle(const char *name="", const char *title="");
    virtual void          SetTitle(const char *title="");    // *MENU*
    virtual void          Sort(Bool_t (*greater)(const TGraph*, Int_t, Int_t)=&TGraph::CompareX,
                               Bool_t ascending=kTRUE, Int_t low=0, Int_t high=-1111);

hist/hist/src/TGraph.cxx

@@ -2202,6 +2202,14 @@ void TGraph::SetPoint(Int_t i, Double_t x, Double_t y)
    if (gPad) gPad->Modified();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+/// Set graph name.
+void TGraph::SetName(const char *name)
+{
+   fName = name;
+   if (fHistogram) fHistogram->SetName(name);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 /// Set graph title.
 
@@ -2211,6 +2219,15 @@ void TGraph::SetTitle(const char* title)
    if (fHistogram) fHistogram->SetTitle(title);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+/// Set graph name and title
+
+void TGraph::SetNameTitle(const char *name, const char *title)
+{
+   SetName(name);
+   SetTitle(title);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 /// if size*2 <= fMaxSize allocate new arrays of size points,
 /// copy points [0,oend).