Description of problem:

I'm unable to start mypaint  under a wayland desktop:

Result:
 mypaint
INFO: mypaint: Installation layout: conventional POSIX-like structure with prefix u'/usr'
INFO: mypaint: There is an old-style configuration area in u'/home/backes/.mypaint/'
INFO: mypaint: Its contents can be migrated to $XDG_CONFIG_HOME and $XDG_DATA_HOME if you wish.
INFO: mypaint: See the XDG Base Directory Specification for info.
INFO: lib.i18n: POSIX: LANG='en_US.utf8'
INFO: lib.i18n: POSIX: LANGUAGE=None
Gdk-Message: Unable to load exchange from the cursor theme
Traceback (most recent call last):
  File "/usr/bin/mypaint", line 464, in <module>
    main.main(datapath, iconspath, old_confpath, version=version)
  File "/usr/share/mypaint/gui/main.py", line 95, in main
    from gui import application
  File "/usr/share/mypaint/gui/application.py", line 54, in <module>
    import filehandling
  File "/usr/share/mypaint/gui/filehandling.py", line 31, in <module>
    import drawwindow
  File "/usr/share/mypaint/gui/drawwindow.py", line 39, in <module>
    import quickchoice
  File "/usr/share/mypaint/gui/quickchoice.py", line 25, in <module>
    import gui.colortools
  File "/usr/share/mypaint/gui/colortools.py", line 20, in <module>
    from colors.hcywheel import HCYAdjusterPage
  File "/usr/share/mypaint/gui/colors/hcywheel.py", line 379, in <module>
    class HCYMaskEditorWheel (HCYHueChromaWheel):
  File "/usr/share/mypaint/gui/colors/hcywheel.py", line 397, in HCYMaskEditorWheel
    __rotate_cursor = gdk.Cursor(gdk.EXCHANGE)
  File "/usr/lib64/python2.7/site-packages/gi/overrides/Gdk.py", line 336, in __new__
    return cls.new(*args, **kwds)
TypeError: constructor returned NULL


Version-Release number of selected component (if applicable):
xpaint-2.9.10.3-4.fc24.x86_64

How reproducible:
always

Steps to Reproduce:
1.See description
2.
3.

Actual results:


Expected results:
mypaint opens GUI

Additional info:
Under gnome/Xorg Desktop, mypaint starts immediately