Merge remote-tracking branch 'remotes/kraxel/tags/ui-20200904-pull-request' into...

Merge remote-tracking branch 'remotes/kraxel/tags/ui-20200904-pull-request' into staging

ui: memleak fixes.
gtk: refresh interval fix.
spice: add mouse buttons.

# gpg: Signature made Fri 04 Sep 2020 08:00:55 BST
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/ui-20200904-pull-request:
  ui/gtk: Update refresh interval after widget is realized
  ui: Add more mouse buttons to SPICE
  vnc-auth-sasl: Plug memleak in vnc_socket_ip_addr_string
  ui/gtk-gl-area: Plug memleak in gd_gl_area_create_context()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>