Possible parentheses missing in code in on_device_removed and on_device_added, in callbacks.c

[pascal-niklaus]

I did not notice any actual misbehavior, but the following code seems odd:

callbacks.c: 578:

  if(!gdk_device_get_device_type(device) == GDK_DEVICE_TYPE_MASTER
     || gdk_device_get_n_axes(device) < 2)
    return;

same again on line 664 (on_device_added).

This would evaluate to TRUE when gdk_device_get_device_type returns values > 0, since GDK_DEVICE_TYPE_MASTER is 0.

If this is correct, maybe better write as gdk_device_get_device_type(device) != GDK_DEVICE_TYPE_MASTER) or
!(gdk_device_get_device_type(device) == GDK_DEVICE_TYPE_MASTER).

[bk138]

That's right, would you like to open a PR changing this to != ?