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fix: diagnostic icons show no explanation — need tooltip or inline message #679

@batonogov

Description

@batonogov

Summary

Diagnostic icons (warning ⚠️, error ❌) appear in the gutter but there is no way to understand what the issue is. No tooltip on hover, no inline message, no panel with details.

Screenshots

  • YAML file (.pre-commit-config.yaml): warning icon on line 1 — unclear why
  • Same file: error icon on line 54 — unclear what the error is

Expected behavior

Hovering over or clicking the diagnostic icon should show the validation message explaining what is wrong.

Implementation ideas

  • Add NSToolTip to the diagnostic icon in the gutter
  • Or show an inline message below the affected line (like VS Code)
  • Or add a Problems panel at the bottom

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    UXUser experiencebugSomething isn't workingeditorCode editor relatedpriority: mediumMedium priority

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