[gtk] (6 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:

  6e79bd4... widget: Try to reuse allocated_transform in size_allocate()
  55ba9f2... widget: Try to reuse priv->transform when allocating

Commits added to the branch:

  47c46f3... menusectionbox: Avoid a gtk_widget_destroy() call
  b3ae86a... widget: Try to reuse allocated_transform in size_allocate()
  623142f... widget: Try to reuse priv->transform when allocating
  a2067f6... range: Clean up compute_slider_position()
  23a0dff... range: Inline function into only caller
  0da5634... range: Remove an outdated comment