[gtk] (10 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/for-master' 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:

  9aada19... calendar: Use widgets for the header
  c61e756... popover: Fix an oversight in gap coord computation

Commits added to the branch:

  185ef21... Update Slovak translation (*)
  d0f6979... Update Friulian translation (*)
  da73394... Update Malay translation (*)
  04beedf... Update Malay translation (*)
  baeadea... calendar: Use widgets for the header (*)
  616a83f... popover: Fix an oversight in gap coord computation (*)
  e77dd3c... widget: Skip not-drawable widgets in snapshot_child
  ca9e503... testcalendar: Close window properly
  e377744... Move GTK_BORDER_STYLE_HIDDEN before GTK_BORDER_STYLE_SOLID
  1301a2f... renderborder: Make simple border case more obvious

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