diagnostics: Use Vec<Tag> instead of Option<Vec<Tag>>

helix-core/src/diagnostic.rs

@@ -43,6 +43,6 @@ pub struct Diagnostic {
     pub message: String,
     pub severity: Option<Severity>,
     pub code: Option<NumberOrString>,
-    pub tags: Option<Vec<DiagnosticTag>>,
+    pub tags: Vec<DiagnosticTag>,
     pub source: Option<String>,
 }

helix-lsp/src/lib.rs

@@ -84,19 +84,18 @@ pub mod util {
             None => None,
         };
 
-        let tags = if let Some(ref tags) = diag.tags {
-            let new_tags = tags
-                .iter()
-                .map(|tag| match tag {
-                    helix_core::diagnostic::DiagnosticTag::Unnecessary => {
-                        lsp::DiagnosticTag::UNNECESSARY
-                    }
-                    helix_core::diagnostic::DiagnosticTag::Deprecated => {
-                        lsp::DiagnosticTag::DEPRECATED
-                    }
-                })
-                .collect();
+        let new_tags: Vec<_> = diag
+            .tags
+            .iter()
+            .map(|tag| match tag {
+                helix_core::diagnostic::DiagnosticTag::Unnecessary => {
+                    lsp::DiagnosticTag::UNNECESSARY
+                }
+                helix_core::diagnostic::DiagnosticTag::Deprecated => lsp::DiagnosticTag::DEPRECATED,
+            })
+            .collect();
 
+        let tags = if !new_tags.is_empty() {
             Some(new_tags)
         } else {
             None

helix-term/src/application.rs

@@ -614,9 +614,9 @@ impl Application {
                                             }
                                         }).collect();
 
-                                        Some(new_tags)
+                                        new_tags
                                     } else {
-                                        None
+                                        Vec::new()
                                     };
 
                                     Some(Diagnostic {