fixup! fixup! feat(ng-dev): add auto merge strategy for pull requests

Author: alan-agius4

ng-dev/pr/merge/strategies/api-merge.ts

@@ -17,6 +17,7 @@ import {FatalMergeToolError, MergeConflictsFatalError} from '../failures.js';
 import {Prompt} from '../../../utils/prompt.js';
 import {AutosquashMergeStrategy} from './autosquash-merge.js';
 import {Commit, parseCommitMessage} from '../../../commit-message/parse.js';
+import {TEMP_PR_HEAD_BRANCH} from './strategy.js';
 
 /** Type describing the parameters for the Octokit `merge` API endpoint. */
 type OctokitMergeParams = RestEndpointMethodTypes['pulls']['merge']['parameters'];
@@ -157,7 +158,10 @@ export class GithubApiMergeStrategy extends AutosquashMergeStrategy {
     // Refresh the target branch the PR has been merged into through the API. We need
     // to re-fetch as otherwise we cannot cherry-pick the new commits into the remaining
     // target branches. Also, this is needed fo the merge comment to get the correct commit SHA.
-    this.fetchTargetBranches([githubTargetBranch]);
+    this.fetchTargetBranches([
+      githubTargetBranch,
+      `pull/${pullRequest.prNumber}/head:${TEMP_PR_HEAD_BRANCH}`,
+    ]);
 
     // If the PR does not need to be merged into any other target branches,
     // we exit here as we already completed the merge.