`presto.partial_update` not updating the supplied region

[themissingcow]

I was attempting to use presto.partial_update, and finding the screen didn't update. Did I miss anything?

Expected Behaviour

The screen is white in the top half, and blue in the bottom.

Observed Behaviour

The screen is blue.

Repro

Run the following snippet on the Presto with release 0.0.7.

from presto import Presto

presto = Presto()
display = presto.display
w, h = display.get_bounds()

BLUE = display.create_pen(28, 181, 202)
WHITE = display.create_pen(255, 255, 255)

display.set_pen(BLUE)
display.clear()

presto.update()

display.set_pen(WHITE)
display.clear()

presto.partial_update(0, 0, w, h // 2)

[MichaelBell]

Partial update currently only works if there is a single layer. Use presto = Presto(layers=1) for that.

Keep this issue open though to track fixing it to work in the default case.

[themissingcow]

Got you, thanks for the clarification 👍