Closing a split editor with annotations causes the Clear Annotations button to get stuck

[eamodio]

Steps to repro:

• Split an editor into 2 tabs so they are side-by-side
• Switch to the left file
• Toggle a file annotation (blame, heatmap, changes, doesn't matter which) in the left file
• Switch to the right file
• Close the left file tab
• 🐛 Clear Annotations button gets stuck on and can't be cleared

[github-actions]

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