Warning in Spyder iPython window whenever I create a canvas in Vispy

Question

Every time I create a vispy Canvas instance in Spyder:

from vispy import app

class Canvas(app.Canvas):
    def __init__(self):
        app.Canvas.__init__(self)

canvas = Canvas()

I start to get warnings like the following in the iPython window:

WARNING: QSocketNotifier: Multiple socket notifiers for same socket 1048 and type Read

Once the canvas instance is created, whenever I type in the iPython console in Spyder, this error starts to occur, so I can't do things like explore modules via tab completion (the warning obliterates the dropdown menu). It also tends to randomly insert itself in stack traces and other places in the console, generally disrupting my workflow (in non-catastrophic ways).

I tried turning off the Warning by turning off Real-time code analysis, as suggested here:
How to suppress a certain warning in Spyder editor?
But it didn't affect the behavior.

I am in Spyder version: 3.2.8 (in an environment that includes spyder-kernels 0.2.6), Python version: 3.6.6, Qt version: 5.6.2, PyQt5 version: 5.6 in Windows 10. This has happened on all three Windows 10 machines I use. I'm running this all in Anaconda. When I run the above code just in the python shell, or from the pure iPython shell, I do not get the warning.