Test deprecated symbols/completions

[jrieken]

re #50972

• any @weinand (macOs)
• any @octref

Complexity: 4

There is now support to tag completions and symbols as deprecated. Such items get a special rendering, namely

• get a strike out
• are dimmed
• don't render match highlights

To test, write an extension that implements a CompletionItemProvider, a DocumentSymbolProvider, and a WorkspaceSymbolProvider and let them return results using the proposed API of CompletionItemTags and SymbolTags. The deprecated tag should be honoured in

• quick outline (cmd+shift+o)
• the outline tree
• workspace symbol search (cmd+t)
• IntelliSense

[jrieken]

fyi - use the vscode-dts-utility to use the latest version of vscode.d.ts and/or vscode.proposed.d.ts

[octref]

What does "don't render match highlights" mean?

[jrieken]

What does "don't render match highlights" mean?

When matching a query/prefix against an item we render matches bold and blue. For deprecated items that isn't happening