Add error handling for misspelled kwargs in adafruit_display_text.label

[bradanlane]

The parameters for the adafruit_display_text.label are anchor_point and anchored_position. This is confusing and results in frequent user errors. The error is not caught by Python which is difficult for a user to debug.

I don't know if there is a generalized solution for catching this type of error.

A solution for this specific case would be to add anchor_position as a property and raise an error on it.

[tannewt]

Are you saying there is no error when anchor_position is given as a kwarg? I'd expect there to be.

[bradanlane]

I may be using kwargs incorrectly.

What I am saying is the following mistake does not generate an error:

from adafruit_display_text import label

tile = label.Label(font, text=msg, color=RED, scale=1, anchor_point=(0.0,0.0), anchor_position=(50, 100))

The result of this code is that anchor_position is ignored - aka has no effect - and results in the tile being at the top of the screen.

[dhalbert]

We had a discussion about this in discord: unknown keyword args are being ignored. I suggested we really need to fix that.

[tannewt]

I think this extra **kwargs is causing this: https://github.com/adafruit/Adafruit_CircuitPython_Display_Text/blob/main/adafruit_display_text/__init__.py#L249 It gets anything that doesn't match and doesn't do anything with it.
I suspect removing it will fix this issue.