Invoke org-edit-src and an edit buffer is displayed for the src block at
point. If that popup is killed incorrectly, it leaves the original org
buffer (specifically, the src block you were editing) in a half-broken
state; forever waiting for you to finish editing that block.
This can happen when the edit window is a popup window and you switch
workspaces (which temporarily deletes popup windows), so clean up those
popups properly before switching.
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