[gtk+] (6 commits) Non-fast-forward update to branch wip/baedert/widget-templates

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/widget-templates' 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:

  8876593... widget: Fix checks in gtk_widget_snapshot()
  099e5ba... widget: Explicitly warn when resizing during size-allocate

Commits added to the branch:

  1573240... widget: Fix checks in gtk_widget_snapshot()
  e7d9dd4... widget: Explicitly warn when resizing during size-allocate
  c4c3f5c... glrenderer: Store uniform locations per program
  20cfb37... glrenderer: Handle color nodes
  da2695f... glrenderer: Add render items for child nodes
  e2950d3... glrenderer: Reuse the GArray for render items