Description of problem:
I was diffing a git file with its origin/main branch.
The view didn't update correctly and only when hovering the mouse over each line in the view could i see its content.

Version-Release number of selected component:
meld-3.21.0-9.fc36

Additional info:
reporter:       libreport-2.17.1
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/app-gnome-org.gnome.Meld-36001.scope
cmdline:        /usr/bin/python3 /usr/bin/meld
crash_function: _get_pixbuf
exception_type: gi.repository.GLib.GError
executable:     /usr/bin/meld
interpreter:    python3-3.10.5-2.fc36.x86_64
kernel:         5.18.5-200.fc36.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
emblemcellrenderer.py:64:_get_pixbuf:gi.repository.GLib.GError: gtk-icon-theme-error-quark: Ikonet “emblem-new” er ikke tilgængeligt i temaet Adwaita (0)

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/meld/ui/emblemcellrenderer.py", line 100, in do_render
    pixbuf = self._get_pixbuf(self.emblem_name, self._emblem_size)
  File "/usr/lib/python3.10/site-packages/meld/ui/emblemcellrenderer.py", line 64, in _get_pixbuf
    pixbuf = icon_theme.load_icon(name, size, 0).copy()
gi.repository.GLib.GError: gtk-icon-theme-error-quark: Ikonet “emblem-new” er ikke tilgængeligt i temaet Adwaita (0)

Local variables in innermost frame:
self: <emblemcellrenderer.EmblemCellRenderer object at 0x7f3901c94cc0 (EmblemCellRenderer at 0x5560c54b7960)>
name: 'emblem-new'
size: 8
icon_theme: <Gtk.IconTheme object at 0x7f3901c7afc0 (GtkIconTheme at 0x5560c3e1aa60)>