de-emphasize duplicate dependencies (#678)

Signed-off-by: Yan Zhang <yanzh@microsoft.com>

src/explorer/decorationProvider.ts

@@ -3,16 +3,20 @@
 
 import * as vscode from "vscode";
 
+const DECORATION_CONFLICT: vscode.FileDecoration = new vscode.FileDecoration("C", "conflict", new vscode.ThemeColor("list.warningForeground"));
+const DECORATION_DUPLICATE: vscode.FileDecoration = new vscode.FileDecoration("D", "duplicate", new vscode.ThemeColor("list.deemphasizedForeground"));
+
 class DecorationProvider implements vscode.FileDecorationProvider {
     private disposables: vscode.Disposable[] = [];
-    private decoration: vscode.FileDecoration = {color: new vscode.ThemeColor("list.warningForeground")};
     constructor() {
         this.disposables.push(vscode.window.registerFileDecorationProvider(this));
     }
 
     public provideFileDecoration(uri: vscode.Uri): vscode.ProviderResult<vscode.FileDecoration> {
         if (uri.query === "hasConflict") {
-            return this.decoration;
+            return DECORATION_CONFLICT;
+        } else if (uri.query === "isDuplicate") {
+            return DECORATION_DUPLICATE;
         } else {
             return null;
         }

src/explorer/model/OmittedStatus.ts

@@ -2,7 +2,7 @@
 // Licensed under the MIT license.
 
 export interface IOmittedStatus {
-    status: string;
+    status: "conflict" | "duplicate" | "normal";
     effectiveVersion: string;
     description?: string;
 }

src/handlers/parseRawDependencyDataHandler.ts

@@ -109,6 +109,8 @@ async function parseTreeNodes(treecontent: string, eol: string, indent: string,
                         break;
                     }
                 }
+            } else if (curNode.omittedStatus.status === "duplicate") {
+                curNode.uri = uri.with({query: "isDuplicate"});
             } else {
                 curNode.uri = uri;
             }