scm: remember worktree visibility across restarts

When a repository is discovered after the initial loading phase has
ended (e.g. git worktrees detected by git.detectWorktrees), the SCM
view service was ignoring the persisted visibility state and making
the repository visible by default. This forced users to re-hide any
worktrees they had previously deselected on every restart.

This change keeps consulting the persisted state for repositories
added after loading finished: if the repository was explicitly
hidden in the previous session, it stays hidden when it is
re-discovered.

Fixes microsoft#271554

Author: yogeshwaran-c

src/vs/workbench/contrib/scm/browser/scmViewService.ts

@@ -405,6 +405,17 @@ export class SCMViewService implements ISCMViewService {
 					this.didSelectRepository = true;
 				}
 			}
+		} else if (this.previousState && this.didFinishLoadingRepositories.get()) {
+			// Even after the initial loading phase has ended, repositories
+			// that are discovered later (e.g. git worktrees) should respect
+			// the previously persisted hidden state so that the user does
+			// not have to hide them again on every restart.
+			const index = this.previousState.all.indexOf(getProviderStorageKey(repository.provider));
+			if (index !== -1 && this.previousState.visible.indexOf(index) === -1) {
+				this.insertRepositoryView(this._repositories, repositoryView);
+				this._onDidChangeRepositories.fire({ added: Iterable.empty(), removed: Iterable.empty() });
+				return;
+			}
 		}
 
 		if (this.selectionModeConfig.get() === ISCMRepositorySelectionMode.Multiple || !this._repositories.find(r => r.selectionIndex !== -1)) {