Retains REPL contents when display.show(None) is called or code.py finishes and REPL is not resized

[kmatch98]

This PR improves upon a previous PR to make the behavior of the REPL more predictable in 99.9% of uses, yet still provide user access to the REPL group.

This resolves #6071

[dhalbert]

Thank you for the quick fix! Tested on FunHouse and PyPortal, with a code.py that throws an exception.

[FoamyGuy]

I am testing this out on a PyPortal and I think I'm seeing some odd behavior
My code.py contains this:

for i in range(3):
    print("Hello World!")

code.py Runs automatically first time upon power up but all of the "Hello World!"s get scrolled off the top of the display leaving none of them showing:

They were visible briefly but scrolled off the top edge.

From here I press ctrl+c to go to the REPL then in the REPL execute something that will raise an error i.e. 78/0

This raises the error and prints the exception message as expected.

Then press ctrl+d to go back to code.py. At this point I see some of the "Hello World!"s but I also still see the divide by zero error which was from the previous REPL instance:

I noticed that the "soft reboot is on." message towards the bottom seems to be getting cut off at the end. It ends with an "r" but the next line does not continue on.

From this point I can continue pressing ctrl+c and ctrl+d without running any additional statements in the REPL and I continue to see the divide by zero error each time even though I'm no longer running the code that caused it.

[dhalbert]

I see that too. I agree, there is something odd going on about which parts of the screen are cleared or where new output goes.

[kmatch98]

Weird, sorry I missed that. Let me take another look.