[gtk+] (31 commits) Non-fast-forward update to branch wip/baedert/gtkimageview

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/gtkimageview' 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:

  c47aacc... Add GtkImageView

Commits added to the branch:

  5d39052... Updated Spanish translation (*)
  ba4e2a7... Visual Studio builds: Support Visual Studio 2017 (*)
  922156d... Update zh_CN translation (*)
  22ea1a5... gtkshow: Prefer gtk_show_uri_on_window() which works for sa (*)
  02e9fb5... widget: Document signal mnemonic-activate (*)
  484ec12... Updated Danish translation (*)
  ecae264... Updated Danish translation (*)
  d2c1e6f... GtkAboutDialog: We use gtk_show_uri_on_window() by default (*)
  c358383... GtkLinkButton: We use gtk_show_uri_on_window() by default (*)
  76dfef6... gtk: Ignore gtk_show_uri() deprecation warnings (*)
  0875aa5... GtkMountOperation: We use gtk_show_uri_on_window() by defau (*)
  51010da... Use gtk_show_uri_on_window() in GtkLabel (*)
  69d2459... combobox—Remove useless button-press-event handler (*)
  0c09e47... combobox—Always popup menu using current event (*)
  aa48399... textiter: fix bug in gtk_text_iter_backward_line() (*)
  385e123... docs/css-properties: Fix info on 3value properties (*)
  d637b0e... filechooserwidget: Fix rename popover position calculation (*)
  e0738b1... builder: avoid an uninitialized value (*)
  548f613... Add a few missing (nullable) annotations (*)
  aebea7d... filechooserwidget: Fix profiling code compilation (*)
  2786d52... filechooserentry: Avoid an uninitialized value (*)
  848d55a... cssimage: Plug a small memory leak (*)
  a0323e5... combobox: Use gtk_widget_measure to measure widgets (*)
  8165b64... paned: Use gtk_widget_measure to measure widget sizes (*)
  0675fce... flowboxchild: Use gtk_widget_measure to measure widget size (*)
  9029bc0... gdk: Ensure GdkDragContext instantly updates drag window po (*)
  1a8a35f... Image—Add some more missing (nullable) annotations (*)
  72801a2... widget: propagate scale factor upon reparenting a widget (*)
  5aee849... Update Slovak translation (*)
  b87f4b2... image: Remove useless queue_resize call
  22d7ea1... Add GtkImageView

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