Missing API for knowing when an extension's decorations get trashed

[fabiospampinato]

Todo+ makes heavy use of dynamic decorations.

It decorates the active document, if it's supported, on onDidChangeActiveTextEditor. As a performance optimization I wanted to skip the decoration logic if the document has already been decorated and its content didn't change.

I think this is impossible to implement because there's no way of knowing if the decorations your extension applied have been trashed or not, sometimes they do get trashed, sometimes they don't.

Fixing #50346 would also fix this issue, but they are not the exactly the same thing

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Show resource decorations in more locations (#37588)
• Cursor appears before decoration on empty lines (#40127)

[vscodebot]

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