Commits on Apr 30, 2022

1. core: Report reason for deferring data read until apply …

   We have two different reasons why a data resource might be read only
   during apply, rather than during planning as usual: the configuration
   contains unknown values, or the data resource as a whole depends on a
   managed resource which itself has a change pending.
   
   However, we didn't previously distinguish these two in a way that allowed
   the UI to describe the difference, and so we confusingly reported both
   as "config refers to values not yet known", which in turn led to a number
   of reasonable questions about why Terraform was claiming that but then
   immediately below showing the configuration entirely known.
   
   Now we'll use our existing "ActionReason" mechanism to tell the UI layer
   which of the two reasons applies to a particular data resource instance.
   The "dependency pending" situation tends to happen in conjunction with
   "config unknown", so we'll prefer to refer that the configuration is
   unknown if both are true.

   

   apparentlymart committed Apr 30, 2022
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