Open overview when there are no diffs on checkout (#7125)

Fixes microsoft/vscode-copilot#18911

Author: alexr00

package.json

@@ -707,6 +707,12 @@
 						"multiDiff",
 						false
 					],
+					"enumDescriptions": [
+						"%githubPullRequests.focusedMode.firstDiff%",
+						"%githubPullRequests.focusedMode.overview%",
+						"%githubPullRequests.focusedMode.multiDiff%",
+						"%githubPullRequests.focusedMode.false%"
+					],
 					"default": "multiDiff",
 					"description": "%githubPullRequests.focusedMode.description%"
 				},

package.nls.json

@@ -144,6 +144,10 @@
 	"githubIssues.queries.default.recentIssues": "Recent Issues",
 	"githubIssues.assignWhenWorking.description": "Assigns the issue you're working on to you. Only applies when the issue you're working on is in a repo you currently have open.",
 	"githubPullRequests.focusedMode.description": "The layout to use when a pull request is checked out. Set to false to prevent layout changes.",
+	"githubPullRequests.focusedMode.firstDiff": "Show the first diff in the pull request. If there are no changes, show the overview.",
+	"githubPullRequests.focusedMode.overview": "Show the overview of the pull request.",
+	"githubPullRequests.focusedMode.multiDiff": "Show all diffs in the pull request. If there are no changes, show the overview.",
+	"githubPullRequests.focusedMode.false": "Do not change the layout.",
 	"githubPullRequests.showPullRequestNumberInTree.description": "Shows the pull request number in the tree view.",
 	"githubPullRequests.labelCreated.description": "Group of labels that you want to add to the pull request automatically. Labels that don't exist in the repository won't be added.",
 	"githubPullRequests.labelCreated.label.description": "Each string element is value of label that you want to add",

src/view/reviewManager.ts

@@ -632,6 +632,11 @@ export class ReviewManager extends Disposable {
 		this._activePrViewCoordinator.show(pr);
 		if (updateLayout) {
 			const focusedMode = vscode.workspace.getConfiguration(PR_SETTINGS_NAMESPACE).get<'firstDiff' | 'overview' | 'multiDiff' | false>(FOCUSED_MODE);
+			if (focusedMode && pr.fileChanges.size === 0) {
+				// If there are no file changes, the only useful thing to show is the overview
+				return this.openDescription();
+			}
+
 			if (focusedMode === 'firstDiff') {
 				if (this._reviewModel.localFileChanges.length) {
 					this.openDiff();