runtime python warnings

[Antoine Martin]

Similar to #2155 but this is for runtime warnings exposed using:

PYTHONWARNINGS=all xpra ...

[Antoine Martin]

• r21881 file leak fixed (harmless)
• r21882 stop calling threads_init() everywhere unnecessarily
• r21883 gobject and gtk warnings
• r21884 child-reaper (not effective..)

---

Server-side, the python2 server runs without any warnings.
With python3:

• some paramiko deprecation warnings (looks trivial):

  /usr/lib/python3.7/site-packages/paramiko/hostkeys.py:23: \
      DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
  

• python-uinput warning (looks trivial):

  /usr/lib64/python3.7/site-packages/uinput/__init__.py:86: \
      DeprecationWarning: SO is deprecated, use EXT_SUFFIX
    _libsuinput_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "_libsuinput" + sysconfig.get_config_var("SO")))
  

• lots of python-dbus warnings
• not sure what this is:

  (Xpra:29448): Gtk-CRITICAL **: 11:09:59.055: gtk_widget_realize: assertion 'widget->priv->anchored || GTK_IS_INVISIBLE (widget)' failed
  

just preceding:

2019-02-26 11:12:23,916 ignoring TEMP window 0x400008
2019-02-26 11:12:23,916 ignoring TEMP window 0x40000b
2019-02-26 11:12:23,916 ignoring TEMP window 0x40000e

---

Client side:

• dumb warning messages not showing what import is causing the actual warning:

  /usr/lib64/python3.7/importlib/_bootstrap.py:219: ImportWarning: can't resolve package from __spec__ or __package__, falling back on __name__ and __path__
    return f(*args, **kwds)
  

• GTK wants us to stop using screens - meh:

  /usr/lib64/python3.7/site-packages/xpra/platform/xposix/gl_context.py:79: \
      DeprecationWarning: Gdk.Screen.get_number is deprecated
    xvinfo = GLX.glXChooseVisual(self.xdisplay, screen.get_number(), attrs)
  

• GTK wants us to listen for specific input devices - meh:

  /usr/lib64/python3.7/site-packages/xpra/client/gtk_base/gtk_client_base.py:674: \
      DeprecationWarning: Gdk.Window.get_pointer is deprecated
    modifiers_mask = self.get_root_window().get_pointer()[-1]
  

• GTK is still trying to alienate developers by removing some very useful features:

  /usr/lib64/python3.7/site-packages/xpra/gtk_common/gtk_util.py:1266: \
      DeprecationWarning: Gtk.ImageMenuItem.set_image is deprecated
    menu_item.set_image(image)
  /usr/lib64/python3.7/site-packages/xpra/gtk_common/gtk_util.py:1271: \
      DeprecationWarning: Gtk.ImageMenuItem.set_always_show_image is deprecated
    menu_item.set_always_show_image(True)
  

• GTK has no replacement for the statusicon they want to remove, so it spews out lots of totally unhelpful warnings there too
• GTK doesn't want us to use set_wmclass - we can always switch to the native API if we have to:

  /usr/lib64/python3.7/site-packages/xpra/client/gtk_base/gtk_client_window_base.py:882: \
      DeprecationWarning: Gtk.Window.set_wmclass is deprecated
    self.set_wmclass(wmclass_name, wmclass_class)
  

• can't remember where this is from, but I think we still need it:

  /usr/lib64/python3.7/site-packages/gi/overrides/GdkPixbuf.py:45: \
     PyGIDeprecationWarning: destroy_fn_data argument deprecated
    warnings.warn(w)
  

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This will do for now, and probably good enough until GTK4 - hopefully we can avoid moving to that.