[gtk] (3 commits) Non-fast-forward update to branch master.struct.msvc

[Chun-wei Fan <fanchunwei src gnome org>]

The branch 'master.struct.msvc' 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:

  b084914... gtk/gtkaccelgroup.c: Fix build on Visual Studio

Commits added to the branch:

  91d8c23... popover: Fix repositioning logic (*)
  ac3d3c6... Merge branch 'popup-positioning-fix' into 'master' (*)
  d0a8d26... gtk/gtkaccelgroup.c: Fix build on Visual Studio

(*) This commit already existed in another branch; no separate mail sent