Bug introduced in 8 or earlier and persisting through 11.2.0
Refresh[expr,None]specifies that the value of
exprshould never automatically be refreshed.
ClearAll[z] Dynamic[Refresh[z, None]]
You will see
z = 2;, the the value above will change from
2, which is unexpected.
z = 4;, this time
2 which is expected.
My interpretation is that updating is not handled with enough care on the first own value creation. Maybe not a major problem but I guess this flaw may lead to more subtle/hard to detect issues with Dynamic updating.
Is it a bug or have I missed something?
[CASE:3995912] was created.
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