Voila does not support IPython's update_display

[patfrench]

Description

Hi
I have 2 problems with my SVG.

1. I have one slider and one SVG, the slider change the text in my SVG with lxml. In my cell notebook it's OK ! but in voila my SVG does not change
2. On my VPS, my SVG is black

Here is the code that causes the problem

Thank you

Reproduce

<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" width="50mm" height="50mm" viewBox="0 0 50 50" version="1.1" id="svg5">
  <defs id="defs2"/>
  <g id="layer1">
    <rect style="fill:#aaeeff;stroke:none;stroke-width:0.499999;stroke-dasharray:1.63028, 0.815139" id="rect234" width="50" height="50" x="0" y="0" rx="0.052267302"/>
    <text xml:space="preserve" style="font-size:12.7px;font-family:Calibri;-inkscape-font-specification:Calibri;fill:#000000;stroke:none;stroke-width:0.499999;stroke-dasharray:1.63028, 0.815139" x="18.358545" y="27.116667" id="text1108"><tspan id="tspan1106" style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:12.7px;font-family:Calibri;-inkscape-font-specification:'Calibri Bold';fill:#000000;stroke-width:0.5" x="18.358545" y="27.116667">25</tspan></text>
  </g>
</svg>

import ipyvuetify as v
from ipywidgets import jslink, Image, Output
from IPython.display import SVG, HTML, display, clear_output, DisplayHandle, Image, update_display,Code
from lxml import etree, html
from threading import Timer

def update_display(valeur_a_afficher):
    val = valeur_a_afficher
    boarder = etree.parse('test.svg')
    b = boarder.iter()
    for data in b:
        if data.attrib.get('id') == "tspan1106":
            data.text = str(val)
            etree.tostring(data)
    boarder.write('test.svg', pretty_print=True, xml_declaration=False,   encoding="utf-8")
    

def on_click(widget, event, data):
    update_display(str(0))
    image.update(SVG(filename='test.svg'))
    #image.update(HTML('<img " src="I-TRANS2.svg"  width="500" height="600">'))
    
def on_incr(widget, event, data):
    global itrans
    update_display(str(widget.v_model))
    image.update(SVG(filename='test.svg'))
    #image.update(HTML('<img " src="I-TRANS2.svg"  width="500" height="600">'))
    
    
button1 = v.Btn(color='primary',children=['RESET AFF'])
button1.on_event('click', on_click)

slider = v.Slider(v_model=50)
slider.on_event('click', on_incr)



image = display(SVG(filename='test.svg'),display_id=True)
#image1 = display(HTML('<img " src="I-TRANS2.svg"  width="500" height="600">'),display_id=True)

v.Layout(class_='pa-2', children=[button1,slider])

1. In my notebook it'ok
2. 
3. In voila (on my personnal computer) the SVG does not update
4. On my VPS

Expected behavior

Context

• voila version 0.2.16 on my personnal computer
• windows 10
• voila version 0.4.0 on my VPS
• ubuntu

If using JupyterLab

• jupyter version on my PC
  IPython : 7.22.0
  ipykernel : 5.3.4
  ipywidgets : 7.6.3
  jupyter_client : 6.1.12
  jupyter_core : 5.0.0
  jupyter_server : 1.4.1
  jupyterlab : 3.0.14
  nbclient : 0.5.3
  nbconvert : 6.0.7
  nbformat : 5.7.0
  notebook : 6.3.0
  qtconsole : 5.0.3
  traitlets : 5.5.0

• jupyter version on my VPS
  IPython : 8.6.0
  ipykernel : 6.17.1
  ipywidgets : 8.0.2
  jupyter_client : 7.4.1
  jupyter_core : 5.0.0
  jupyter_server : 1.23.2
  jupyterlab : 3.5.0
  nbclient : 0.7.0
  nbconvert : 7.2.5
  nbformat : 5.7.0
  notebook : 6.5.2
  qtconsole : 5.4.0
  traitlets : 5.5.0

Thank you

[martinRenou]

Thanks for opening an issue. By design, update_display (what display(display_id=...) does under the hood) cannot work in Voila for now. We may want to support it though.