Code Quality: Reduce git folders loading time (#12980)

Author: ferrariofilippo

src/Files.App/Data/Models/CurrentInstanceViewModel.cs

@@ -179,11 +179,7 @@ public string GitBranchName
 			get
 			{
 				if (IsGitRepository)
-				{
-					using var repository = new Repository(gitRepositoryPath);
-					return repository.Branches.FirstOrDefault(branch =>
-						branch.IsCurrentRepositoryHead)?.FriendlyName ?? string.Empty;
-				}
+					return GitHelpers.GetRepositoryHeadName(gitRepositoryPath);
 
 				return string.Empty;
 			}

src/Files.App/Utils/Git/GitHelpers.cs

@@ -25,6 +25,8 @@ internal static class GitHelpers
 
 		private const int END_OF_ORIGIN_PREFIX = 7;
 
+		private const int MAX_NUMBER_OF_BRANCHES = 15;
+
 		private static readonly ILogger _logger = Ioc.Default.GetRequiredService<ILogger<App>>();
 
 		private static readonly IDialogService _dialogService = Ioc.Default.GetRequiredService<IDialogService>();
@@ -112,12 +114,22 @@ public static BranchItem[] GetBranchesNames(string? path)
 			return repository.Branches
 				.Where(b => !b.IsRemote || b.RemoteName == "origin")
 				.OrderByDescending(b => b.IsCurrentRepositoryHead)
-				.ThenBy(b => b.IsRemote)
 				.ThenByDescending(b => b.Tip?.Committer.When)
+				.Take(MAX_NUMBER_OF_BRANCHES)
 				.Select(b => new BranchItem(b.FriendlyName, b.IsRemote, b.TrackingDetails.AheadBy, b.TrackingDetails.BehindBy))
 				.ToArray();
 		}
 
+		public static string GetRepositoryHeadName(string? path)
+		{
+			if (string.IsNullOrWhiteSpace(path) || !Repository.IsValid(path))
+				return string.Empty;
+
+			using var repository = new Repository(path);
+			return repository.Branches
+				.FirstOrDefault(b => b.IsCurrentRepositoryHead)?.FriendlyName ?? string.Empty;
+		}
+
 		public static async Task<bool> Checkout(string? repositoryPath, string? branch)
 		{
 			Analytics.TrackEvent("Triggered git checkout");

src/Files.App/ViewModels/Previews/FolderPreviewViewModel.cs

@@ -50,14 +50,14 @@ private async Task LoadPreviewAndDetailsAsync()
 				!string.IsNullOrEmpty(repoPath))
 			{
 				var gitDirectory = GitHelpers.GetGitRepositoryPath(Folder.Path, Path.GetPathRoot(Folder.Path));
-				var branches = GitHelpers.GetBranchesNames(gitDirectory);
+				var headName = GitHelpers.GetRepositoryHeadName(gitDirectory);
 				var repositoryName = GitHelpers.GetOriginRepositoryName(gitDirectory);
 
 				if(!string.IsNullOrEmpty(gitDirectory))
 					Item.FileDetails.Add(GetFileProperty("GitOriginRepositoryName", repositoryName));
 
-				if (branches.Length > 0)
-					Item.FileDetails.Add(GetFileProperty("GitCurrentBranch", branches.First().Name));
+				if (!string.IsNullOrWhiteSpace(headName))
+					Item.FileDetails.Add(GetFileProperty("GitCurrentBranch", headName));
 			}
 		}