file-search: fix paths

The commit fixes the paths which are displayed during the
`quick-file-search`:

- direct child resources of a root should not have a description
- fixes root-name for multi-root workspaces
- fixes label for multi-root workspaces when they are direct child
  resources of the given root.

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

packages/file-search/src/browser/quick-file-open.ts

@@ -322,14 +322,21 @@ export class QuickFileOpenService implements QuickAccessProvider {
     }
 
     private getItemDescription(uri: URI): string {
-        let description = this.labelProvider.getLongName(uri.parent);
+        const resourcePathLabel = this.labelProvider.getLongName(uri.parent);
+        const rootUri = this.workspaceService.getWorkspaceRootUri(uri);
+
+        // Display the path normally if outside any workspace root.
+        if (!rootUri) {
+            return resourcePathLabel;
+        }
+
+        // Compute the multi-root label for the resource.
         if (this.workspaceService.isMultiRootWorkspaceOpened) {
-            const rootUri = this.workspaceService.getWorkspaceRootUri(uri);
-            if (rootUri) {
-                description = `${this.labelProvider.getLongName(rootUri)} • ${description}`;
-            }
+            const rootLabel = this.labelProvider.getName(rootUri);
+            return rootUri.path.toString() === uri.parent.path.toString() ? `${rootLabel}` : `${rootLabel} • ${resourcePathLabel}`;
+        } else {
+            return rootUri.toString() === uri.parent.toString() ? '' : resourcePathLabel;
         }
-        return description;
     }
 
     private getPlaceHolder(): string {