Text shaping issues in SVG rendering

[francozanardi]

Description

Ligatures and multi-character emojis are not working correctly in SVG rendering.

Steps to reproduce

from pictex import *

text = "hello 👩‍🔬"
canvas = Canvas().color("orange").font_family("EduNSWACTCursive-Regular.ttf")
canvas.render(text).save("shaping.png")
canvas.render_as_svg(text).save("shaping.svg")

shaping.png:

shaping.svg: