printChar does not block

[pelikhan]

This code in MakeCode leads to a blank screen because X is erased immediately by clearScreen

input.onButtonPressed(Button.A, function () {
    basic.showString("X")
    basic.clearScreen()
})

The showString function in PXT calls into printChar.

https://github.com/microsoft/pxt-microbit/blame/50ec105c4faeaca8bf1ac8636b5b5021afd937ba/libs/core/basic.cpp#L37

Could this be related to the new fibers?

[pelikhan]

pxt bug: microsoft/pxt-microbit#2821

[pelikhan]

@finneyj @jamesadevine

[finneyj]

@pelikhan

Thanks - Fixed in v2.2.0-rc4

I went through the while print() family of methods and tested/unified behaviour, so hopefully we won't see any more regressions in MicroBitDisplay.

[pelikhan]

The print method now clears the screen after executing. This is a breaking change from the previous behavior. Can we revert to leaving the screen as is?

https://github.com/lancaster-university/microbit-dal/releases/tag/v2.2.0-rc4

[finneyj]

unintentional - apologies @pelikhan

fixed in 673228f

v2.2.0-rc5

[pelikhan]

All bugs are features by now :)