[gtk+] (5 commits) Non-fast-forward update to branch wip/dboles/combobox-cleanup

[Daniel Boles <dboles src gnome org>]

The branch 'wip/dboles/combobox-cleanup' 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:

  0c5bd77... combobox: Drop a workaround from the list mode age
  b9cb304... combobox: popdown() the menu during unmap()
  71671aa... combobox: Stop incessantly NULL-checking the menu
  93abc1c... combobox: Factor repeated code out to function
  f988ee6... combobox: Remove popup_for_device()

Commits added to the branch:

  031f398... combobox: Drop a workaround from the list mode age
  6055184... combobox: popdown() the menu during unmap()
  2573ba3... combobox: Stop incessantly NULL-checking the menu
  b9380fb... combobox: Factor repeated code out to function
  187ac1c... combobox: Remove popup_for_device()