fix: disable "focus active document" comment when not using Sourcegraph

Author: olafurpg

package.json

@@ -138,7 +138,8 @@
         "icon": {
           "light": "icons/focus-light.svg",
           "dark": "icons/focus-dark.svg"
-        }
+        },
+        "enablement": "sourcegraph.canFocusActiveDocument"
       },
       {
         "command": "extension.openFile",

src/commands/openSourcegraphUriCommand.ts

@@ -4,7 +4,6 @@ import { CompareRange, SourcegraphUri } from '../file-system/SourcegraphUri'
 import { log } from '../log'
 
 export async function openSourcegraphUriCommand(fs: SourcegraphFileSystemProvider, uri: SourcegraphUri): Promise<void> {
-    log.appendLine(`uri=${uri.uri}`)
     if (uri.compareRange) {
         await openCompareUri(uri, uri.compareRange)
         return

src/file-system/FilesTreeDataProvider.ts

@@ -133,6 +133,12 @@ export class FilesTreeDataProvider implements vscode.TreeDataProvider<string> {
         this.didFocusToken.cancel()
         this.didFocusToken = new vscode.CancellationTokenSource()
         this.activeUri = vscodeUri
+        vscode.commands
+            .executeCommand('setContext', 'sourcegraph.canFocusActiveDocument', vscodeUri?.scheme === 'sourcegraph')
+            .then(
+                () => {},
+                () => {}
+            )
         if (vscodeUri && vscodeUri.scheme === 'sourcegraph' && this.treeView && this.isTreeViewVisible) {
             const uri = this.fs.sourcegraphUri(vscodeUri)
             await this.fs.downloadFiles(uri)