Before, `pp.instantiateMVars` generally had no effect because most call sites for the pretty printer instantiated metavariables first, but now this functionality is entrusted upon the `pp.instantiateMVars` option. This also has an effect in hovers, where metavariables can be unfolded one assignment at a time. However, the goal state still sees all metavariables instantiated due to the fact that the algorithm relies on expression equality post-instantiation (see `Lean.Widget.goalToInteractive`). Closes #4406 |
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