5d54b0b13f
This PR fixes a bug introduced in #7830 where if the cursor is at the indicated position ```lean example (as bs : List Nat) : (as.append bs).length = as.length + bs.length := by induction as with | nil => -- cursor | cons b bs ih => ``` then the Infoview would show "no goals" rather than the `nil` goal. The PR also fixes a separate bug where placing the cursor on the next line after the `induction`/`cases` tactics like in ```lean induction as with | nil => sorry | cons b bs ih => sorry I -- < cursor ``` would report the original goal in the goal list. Furthermore, there are numerous improvements to error recovery (including `allGoals`-type logic for pre-tactics) and the visible tactic states when there are errors. Adds `Tactic.throwOrLogErrorAt`/`Tactic.throwOrLogError` for throwing or logging errors depending on the recovery state. |
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