[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] macOS --metal backwards compatibility regarding primitives 126, 127, 231 (Issue #627)

[Marcel Taeumel]

>Well, this would be trivial to make backwards compatible were the necessary old image fix only
PasteUpMorph disableDeferredUpdates: true.

I think it might already be since the morphic canvas is set to `nil` when shutting down the image.

>introduce a new flag bit in the image flags

Wouldn't this decrease compatibility of newer images with older VMs?

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