../src/Widgets/ColorHistory.vala:183.45-183.78: warning: Gtk.StyleContext.get_background_color has been deprecated since 3.16
../src/Widgets/Picker.vala:76.31-76.46: warning: Gdk.Screen.get_width has been deprecated since 3.22
../src/Widgets/Picker.vala:76.52-76.68: warning: Gdk.Screen.get_height has been deprecated since 3.22
../src/Widgets/Picker.vala:135.14-135.24: warning: Gtk.Widget.get_pointer has been deprecated since 3.4
../src/Widgets/Picker.vala:223.27-223.71: warning: Gdk.Display.get_device_manager has been deprecated since 3.20.
../src/Widgets/Picker.vala:224.13-224.38: warning: Gdk.DeviceManager.get_client_pointer has been deprecated since 3.20
../src/Widgets/Picker.vala:224.13-224.46: warning: Gdk.Device.grab has been deprecated since 3.20.
../src/Widgets/Picker.vala:245.13-245.23: warning: Gtk.Widget.get_pointer has been deprecated since 3.4
../src/Widgets/Picker.vala:246.27-246.71: warning: Gdk.Display.get_device_manager has been deprecated since 3.20.
../src/Widgets/Picker.vala:257.21-257.46: warning: Gdk.DeviceManager.get_client_pointer has been deprecated since 3.20
../src/Widgets/Picker.vala:260.21-260.46: warning: Gdk.DeviceManager.get_client_pointer has been deprecated since 3.20
../src/Widgets/Picker.vala:263.21-263.46: warning: Gdk.DeviceManager.get_client_pointer has been deprecated since 3.20
../src/Widgets/Picker.vala:266.21-266.46: warning: Gdk.DeviceManager.get_client_pointer has been deprecated since 3.20
../src/Widgets/Picker.vala:301.27-301.71: warning: Gdk.Display.get_device_manager has been deprecated since 3.20.
../src/Widgets/Picker.vala:302.27-302.52: warning: Gdk.DeviceManager.get_client_pointer has been deprecated since 3.20
../src/Widgets/Picker.vala:306.26-306.37: warning: Gdk.Device.grab has been deprecated since 3.20.
../src/Widgets/Picker.vala:314.17-314.30: warning: Gdk.Device.ungrab has been deprecated since 3.20.
../src/Widgets/Picker.vala:321.26-321.38: warning: Gdk.Device.grab has been deprecated since 3.20.
../src/Widgets/Picker.vala:329.21-329.35: warning: Gdk.Device.ungrab has been deprecated since 3.20.
Compilation succeeded - 19 warning(s)
Fixes these warnings on compile: