Exclude current user from suggested reviewers in gh pr create

Query the viewer login in SuggestedReviewerActorsForRepo and
pre-seed the seen map so the current user is filtered out of
collaborator results. You cannot review your own PR.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: BagToad

api/queries_pr_review.go

@@ -556,6 +556,9 @@ func SuggestedReviewerActors(client *Client, repo ghrepo.Interface, prID string,
 // Returns the candidates, a MoreResults count, and an error.
 func SuggestedReviewerActorsForRepo(client *Client, repo ghrepo.Interface, query string) ([]ReviewerCandidate, int, error) {
 	type responseData struct {
+		Viewer struct {
+			Login string
+		}
 		Repository struct {
 			// HACK: There's no repo-level API to check Copilot reviewer eligibility,
 			// so we piggyback on an open PR's suggestedReviewerActors to detect
@@ -610,8 +613,13 @@ func SuggestedReviewerActorsForRepo(client *Client, repo ghrepo.Interface, query
 		return nil, 0, err
 	}
 
-	// Build candidates using cascading quota logic
+	// Build candidates using cascading quota logic.
+	// Pre-seed seen with the current user to exclude them from results
+	// since you cannot review your own PR.
 	seen := make(map[string]bool)
+	if result.Viewer.Login != "" {
+		seen[result.Viewer.Login] = true
+	}
 	var candidates []ReviewerCandidate
 	const baseQuota = 5
 

api/queries_pr_test.go

@@ -390,6 +390,7 @@ func mockReviewerResponseForRepoWithCopilot(collabs, teams, totalCollabs, totalT
 
 	return fmt.Sprintf(`{
 		"data": {
+			"viewer": {"login": "testuser"},
 			"repository": {
 				%s,
 				"collaborators": {"nodes": [%s]},
@@ -500,6 +501,36 @@ func TestSuggestedReviewerActorsForRepo(t *testing.T) {
 			expectedLogins: []string{"c1", "c2", "c3", "OWNER/team1", "OWNER/team2"},
 			expectedMore:   10,
 		},
+		{
+			name: "viewer excluded from collaborators",
+			httpStubs: func(reg *httpmock.Registry) {
+				// c1 matches the viewer login "testuser" won't be in this fixture,
+				// but we can craft a response where the viewer login matches a collaborator.
+				reg.Register(
+					httpmock.GraphQL(`query SuggestedReviewerActorsForRepo\b`),
+					httpmock.StringResponse(`{
+						"data": {
+							"viewer": {"login": "c2"},
+							"repository": {
+								"pullRequests": {"nodes": []},
+								"collaborators": {"nodes": [
+									{"login": "c1", "name": "C1"},
+									{"login": "c2", "name": "C2"},
+									{"login": "c3", "name": "C3"}
+								]},
+								"collaboratorsTotalCount": {"totalCount": 3}
+							},
+							"organization": {
+								"teams": {"nodes": []},
+								"teamsTotalCount": {"totalCount": 0}
+							}
+						}
+					}`))
+			},
+			expectedCount:  2,
+			expectedLogins: []string{"c1", "c3"},
+			expectedMore:   3,
+		},
 	}
 
 	for _, tt := range tests {