displayio: add, check "readonly" flag for groups #8923
Merged
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Testing performed on pycamera / memento
However, for some reason serial output wasn't echoing back to the computer(!) during my test, I could only read it on the LCD(!). I can't guess why this could be related to this PR but maybe it is; I haven't seen it before now and it's a weird failure to go unnoticed for any length of time. [reproduced with c84c066 but not on a different computer, so I'll chalk it up to "laptop needs to be rebooted and is acting out"]
closes: #8873