gtk+ 3.22.5 release.

• 771242 opening menu for certain types of GtkComboBox causes Gdk-CRITICAL assertion...
• 774114 Window shadows are repainted even if only the contents of the window change
• 774265 No tilt for wintab devices
• 774379 gdk: mingw64 builds segfault during initialization of Huion H610PRO wintab
• 774686 GtkMenu does not unref all GtkCheckMenuItem it creates
• 774695 GtkProgressbar needs full and empty classes
• 774699 list iteration regression causes odd-indexed devices to be ignored during l...
• 774743 GtkNotebook does not unref all GtkBuiltinIcon it creates
• 774760 inspector: ensure controller is a GtkGesture
• 774790 GtkTextHandle does not unref all GtkAdjustment it references
• 774893 Application font sizes scaling gets clamped to 1.00 when starting GtkInspector
• 774915 Destroying the parent of a subsurface causes _gdk_window_destroy_hierarchy:...
• 774917 [wayland] child subsurfaces need to be placed relative to their parent
• 774939 GtkLabelAccessible: Initialize link before setting parent
• 775212 GtkScaleButton does not unref all GtkAdjustment it references
• 775316 gtk_drag_source_set_icon_pixbuf references the pixbuf received once too much
• 775319 gdk_window_get_toplevel() fails to return the toplevel of a child subsurface
• 775525 gtk_flow_box_get_child_at_index shouldn't crash with an invalid index