TLegend header drawn in different position with jsroot and more than 1 column

[Zehvogel]

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Description

How it is displayed in the Jupyter notebook:

How the saved pdf looks like:

I would expect them to look as similar as possible (note also the differences in the margins of the text...)

Reproducer

make a TLegend with a header and a couple of entries, SetNColumns(2) and compare

ROOT version

   ------------------------------------------------------------------
  | Welcome to ROOT 6.38.00                        https://root.cern |
  | (c) 1995-2025, The ROOT Team; conception: R. Brun, F. Rademakers |
  | Built for linuxx8664gcc on Dec 21 2025, 15:58:20                 |
  | From tags/6-38-00@6-38-00                                        |
  | With g++ (Spack GCC) 14.2.0 std202002                            |
  | Try '.help'/'.?', '.demo', '.license', '.credits', '.quit'/'.q'  |
   ------------------------------------------------------------------

Installation method

source /cvmfs/sw-nightlies.hsf.org/key4hep/setup.sh -r 2026-02-06

Operating system

Alma9

Additional context

No response

[couet]

I guess the rendering on screen is done via web graphics. Let see what @linev can say about it.

[linev]

@Zehvogel

Please attach canvas saved in ROOT file.
So I can debug myself.

[linev]

When attach root files here - rename it into file.root.txt

[dpiparo]

unrelated: I love the colour scheme!

[Zehvogel]

@linev

import ROOT
c = ROOT.TCanvas()
l = ROOT.TLegend(0., 0., 1., 1.)
l.SetHeader("header")
l.AddEntry(0, "entry1")
l.AddEntry(0, "entry2")
l.SetNColumns(2)
l.Draw()
c.Draw()
c.SaveAs("legend.pdf")