[gtk+] (77 commits) Non-fast-forward update to branch wip/attente/popup-at

[William Hua <williamhua src gnome org>]

The branch 'wip/attente/popup-at' 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:

  b4a59b4... gdkwindow: store shadow sizes
  5de231d... gdkwindow: add gdk_window_move_to_rect ()
  1184798... gtkmenu: add gtk_menu_popup_at_* ()
  33960c5... gtkmenu: position menu using gdk_window_move_to_rect ()
  fddcc86... add demo for testing gtk_menu_popup_at_* ()
  97591f1... port to new gtk_menu_popup_at_* () functions

Commits added to the branch:

  847f9f4... Mention single-stop gradients in the release notes (*)
  080fdfa... docs: Fix a typo in GDK sections file (*)
  bb2ca3b... wayland: fix error handling for memfd_create (*)
  2f3cb31... wayland: fall back to shm_open if memfd unavailable (*)
  631f6b5... configure: fix detecting CUPS 2.x (*)
  552e436... Updated Brazilian Portuguese translation (*)
  ed2bb7e... Updated Brazilian Portuguese translation (*)
  1c6b878... shortcuts window: Fix handling of significant xml chars (*)
  76bacfd... style cascade: Allow cascades with more ancestors (*)
  51799d4... GtkActionHelper: Change a message to a warning (*)
  e33e23a... treeview: Ensure the treeview has the implicit grab before  (*)
  37e913d... widget factory: Adapt to new scrolled window behavior (*)
  76af907... Add a release note for scrolled windows (*)
  2fd9849... gtk-demo: Fix up some warnings (*)
  c2534af... gtk3-demo: Fix the modelbutton example (*)
  815cc23... gtk-demo: Use max-content-height in the popover example (*)
  8a28122... shortcuts: Try harder to disambiguate search items (*)
  e01f35e... gtk3-demo: Make the filter model example more interesting (*)
  dff61b0... Updates (*)
  0eeaa93... wayland: do not set PRIMARY selection if focus is lost (*)
  1ebfe1d... Skip GdkDrawingContext in some tests (*)
  49bd5a9... 3.21.3 (*)
  3724592... listbox: short-circuit if no sort function is set (*)
  ed227f9... GtkPopover: Honor widget margins when calculating tail posi (*)
  3b98a2d... demos: Simplify popovers demo (*)
  f44b9ef... GtkColorEditor: Keep ref on pre-popup focus widget (*)
  c2ba9ca... Visual Studio builds: Make .pc generation more flexible (*)
  40ee61a... gtk: Keep Firefox working in the DrawingContext world (*)
  3947ff4... Updated Portuguese translation (*)
  01eda20... headerbar: don't allocate both label and custom title (*)
  78eccd0... headerbar: don't use GTK_PACK_* as indices into array (*)
  8430be7... Fix an array overrun (*)
  e0bebba... headerbar: simplify calculation in size allocation code (*)
  eccfce5... headerbar: simplify some size allocation code (*)
  847a43c... headerbar: compute nominal size of sides up front (*)
  0015ebc... headerbar: support expand property for children (*)
  21c94de... Updated Indonesian translation (cherry picked from commit 3 (*)
  b5920a2... Updated Indonesian translation (*)
  d74e4af... Adwaita: restrict infobar styling to, well, infobars (*)
  ebccc8b... Adwaita: color the selection of entries with error... (*)
  4731be0... Updated Hebrew translation (*)
  0587f25... Updated Indonesian translation (cherry picked from commit 2 (*)
  325fc60... Updated Indonesian translation (*)
  cd44f6d... Fix build of commit f23e99b (*)
  5f52583... gtk/gtkstylecascade.c: Declare variables at beginning of bl (*)
  d52f6ff... widget: Don't unnecessarily export function (*)
  9f5b9c0... GtkWindow: Fix dragging on non-titlebar widgets (*)
  0c1cc98... gtkfilesystem: Improve heuristics to detect remote filesyst (*)
  92de947... GtkWindow: Check for GtkWidget-window-dragging in multipres (*)
  38fbe68... gdk: do not provide display command line argument on window (*)
  46748b4... gdk: actually fix the previous commit (*)
  b480d9c... configure: fix "AC_RUN_IFELSE was called before AC_USE_SYST (*)
  386d17d... headerbar: don't throw a warning if title widget is hidden (*)
  51444b7... gtk/gtkstylecascade.c: Fix formatting (*)
  4b003a7... wayland: Implement gdk_utf8_to_string_target (*)
  0d30ad2... wayland: Separate selection buffers and other per-selection (*)
  a43fce0... print dialog: Apply initial capabilities (*)
  22b6df0... Fix example Makefiles (*)
  3c7cd7a... GtkApplication: Add support for the Xfce session manager (*)
  c8a74a1... Simplify the xfce session manager support (*)
  369db4a... css: add background-blend-mode support (*)
  27fea1c... css: add documentation for background-blend-mode (*)
  1d93cc2... demo: add a demo for blend modes (*)
  3498623... css parser: Improve an error message (*)
  3c4be3c... Fix parsing of some css properties (*)
  507e58d... gtk3-demo: Make blendmodes example non-resizable (*)
  4c01ab8... Updated POTFILES.skip (*)
  298221b... wayland: return child only in device_query_state() (*)
  e032c83... wayland: remove unneeded statement (*)
  93f2031... gtk3-demo: Simplify the blendmodes example a bit (*)
  cbcf3f9... gdkwindow: store shadow sizes
  69ac8b1... gdkwindow: add gdk_window_move_to_rect ()
  4b3d2ea... gtkmenu: add gtk_menu_popup_at_* ()
  8f3c238... gtkmenu: position menu using gdk_window_move_to_rect ()
  9586250... add demo for testing gtk_menu_popup_at_* ()
  22655a6... port to new gtk_menu_popup_at_* () functions
  70b5ba9... mir: implement gdk_window_move_to_rect ()

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