Merge #2555

2555: LSP 3.15 supports the deprecated tag on completions r=matklad a=kjeremy

So let's set it.

Co-authored-by: kjeremy <kjeremy@gmail.com>

crates/ra_lsp_server/src/conv.rs

@@ -130,6 +130,11 @@ impl ConvWith<(&LineIndex, LineEndings)> for CompletionItem {
             deprecated: Some(self.deprecated()),
             ..Default::default()
         };
+
+        if self.deprecated() {
+            res.tags = Some(vec![lsp_types::CompletionItemTag::Deprecated])
+        }
+
         res.insert_text_format = Some(match self.insert_text_format() {
             InsertTextFormat::Snippet => lsp_types::InsertTextFormat::Snippet,
             InsertTextFormat::PlainText => lsp_types::InsertTextFormat::PlainText,