Contribute open changes button to copilot-cloud-agent (#8039)

* contribute open changes button to copilot-cloud-agent

* formatting

* use shared helper

Author: joshspicer

package.json

@@ -3554,6 +3554,9 @@
 				},
 				{
 					"command": "pr.applyChangesFromDescription"
+				},
+				{
+					"command": "pr.openChanges"
 				}
 			]
 		},

src/commands.ts

@@ -716,7 +716,7 @@ export function registerCommands(
 	}));
 
 	context.subscriptions.push(
-		vscode.commands.registerCommand('pr.openChanges', async (pr: PRNode | RepositoryChangesNode | PullRequestModel | OverviewContext | ChatSessionWithPR | undefined) => {
+		vscode.commands.registerCommand('pr.openChanges', async (pr: PRNode | RepositoryChangesNode | PullRequestModel | OverviewContext | ChatSessionWithPR | { path: string } | undefined) => {
 			if (pr === undefined) {
 				// This is unexpected, but has happened a few times.
 				Logger.error('Unexpectedly received undefined when picking a PR.', logId);
@@ -739,7 +739,21 @@ export function registerCommands(
 					preventDefaultContextMenuItems: true,
 				});
 				pullRequestModel = resolved?.pr;
-			} else {
+			}
+			else if (contextHasPath(pr)) {
+				const { path } = pr;
+				const prNumber = prNumberFromUriPath(path);
+				if (!prNumber) {
+					return vscode.window.showErrorMessage(vscode.l10n.t('No pull request number found in context path.'));
+				}
+				const folderManager = reposManager.folderManagers[0];
+				const pullRequest = await folderManager.fetchById(folderManager.gitHubRepositories[0], Number(prNumber));
+				if (!pullRequest) {
+					return vscode.window.showErrorMessage(vscode.l10n.t('Unable to find pull request #{0}', prNumber.toString()));
+				}
+				pullRequestModel = pullRequest;
+			}
+			else {
 				const resolved = await resolvePr(pr as OverviewContext);
 				pullRequestModel = resolved?.pr;
 			}