[Z (bad) label for palette axis in TH3D

[couet]

I have done something:

void testTH3Title() {
   gStyle->SetOptStat(0);
   auto C = new TCanvas();
   C->Divide(2,1);

   C->cd(1)->SetRightMargin(0.2);
   auto h2 = new TH2F("h2","h2",10,0.,1.,10,0.,1.);
   h2->SetTitle("h2-Title;XXXXX;YYYYY;ZZZZZ;TTTTTT");
   h2->Fill(0.5, 0.5,10.);
   h2->Draw("COLZ");

   C->cd(2)->SetRightMargin(0.2);
   auto h3 = new TH3D("h3", "h3",10, 1., 5.,10 , 1., 5.,10 , 1., 5.);
   h3->Fill(3, 3, 3, 10.);
   h3->Draw("box2 z");
   h3->SetTitle("h3-Title;XXXXX;YYYYY;ZZZZZ;TTTTTT");
}

I’ll make a PR