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WIP: Display flash message when Markdown preview fails

username-removed-14714 requested to merge winniehell/gitlab-ce:add-flash-message-for-failed-preview into master

What does this MR do?

  • display a flash message Could not load preview!when Markdown preview fails

Why was this MR needed?

  • no user feedback when preview failed

What are the relevant issue numbers?

fixes part of #19057 (moved)

Screenshots

preview-failed-flash

Does this MR meet the acceptance criteria?

  • Tests
    • Added for this feature/bug
    • All builds are passing

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