Show LEDs on hardware does not match the old behavior

[riknoll]

In the latest beta, calling showLeds clears the screen after the interval has passed. The old behavior was to leave the last displayed image up on the screen.

Here's a MakeCode program that demonstrates it:

input.onButtonPressed(Button.A, function() {
    basic.showLeds(`
    . . . . .
    . # . # .
    . . . . .
    # . . . #
    . # # # .
    `)
})

This only shows up on the hardware, not in the sim

[riknoll]

@finneyj FYI

[pelikhan]

I'll investigate to see if this was my change.

[pelikhan]

Regression in microbit-dal lancaster-university/microbit-dal#463

[finneyj]

arrgh. Though I'd nailed these - sorry guys.

To clarify, for consistency in MakeCode, all print() methods (be it char, string or image) should not clear the screen for length==1 operations?

[finneyj]

clarification - even when a duration is explicitly set?

[finneyj]

Apologies. Fixed in microbit-dal v2.2.0-rc5

[pelikhan]

No clearing when it does not scroll.