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This change was introduced by @naotake51 as PR #2532, but it was closed before I had a chance to review it, and I have been unable to communicate with the author since. I will gladly defer to the original. Please see the original PR for details.
Similarly, PR #2237 (@AdamGaskins) is open, but with changes requested for several months. It covers a lot of the same ground as 2532. It makes sense to me to combine them.
To those changes I added support for the 'editAs' attribute - I imagine that there are instances of 'absolute' out in the wild.
There have been several other tickets referencing two cell anchors, including issue #1159 and PR #1160 (@sgarwood, who also added support for editAs), PR #643, and issue #126, all now closed but not necessarily entirely resolved. I will try to ensure that those tickets are addressed with this one.
And, in trying to make sure 1160 is covered, I stumbled upon a bug. If you use the same image resource to create two+ memory drawings, the MemoryDrawing destructor for the first will cause the rest to generate a very long warning message. This is not a problem for Php8+, only for Php7-. I have suppressed the message in the MemoryDrawing constructor. 1160 went stale due to an unresolved test error, but I don't think this was the problem. At any rate, its test works now.
This is:
Checklist:
Why this change is needed?