[goocanvas] (2 commits) Non-fast-forward update to branch wip/murrayc/gtk4

[Murray Cumming <murrayc src gnome org>]

The branch 'wip/murrayc/gtk4' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  d009753... gtk4: demo: Remove use of gtk_container_set_border_width().
  d13f662... gkt4: demo: Adjust calls to gtk_box_pack_start().

Commits added to the branch:

  ad83638... gkt4: demo: Adjust calls to gtk_box_pack_start().
  41f33b0... gtk4: Replace calls to gtk_container_set_border_width().