Fix bug with long folder templates

Source/LibationAvalonia/Dialogs/EditTemplateDialog.axaml.cs

@@ -103,7 +103,7 @@ namespace LibationAvalonia.Dialogs
 				get => _userTemplateText;
 				set
 				{
-					_userTemplateText = value;
+					this.RaiseAndSetIfChanged(ref _userTemplateText, value);
 					templateTb_TextChanged();
 				}
 			}
@@ -165,7 +165,13 @@ namespace LibationAvalonia.Dialogs
 				var books = config.Books;
 				var folder = Templates.Folder.GetPortionFilename(
 					libraryBookDto,
-					isFolder ? workingTemplateText : config.FolderTemplate);
+				//Path must be rooted for windows to allow long file paths. This is
+				//only necessary for folder templates because they may contain several
+				//subdirectories. Without rooting, we won't be allowed to create a
+				//relative path longer than MAX_PATH
+				Path.Combine(books, isFolder ? workingTemplateText : config.FolderTemplate));
+
+				folder = Path.GetRelativePath(books, folder);
 
 				var file
 				= Template == Templates.ChapterFile

Source/LibationWinForms/Dialogs/EditTemplateDialog.cs

@@ -98,11 +98,17 @@ namespace LibationWinForms.Dialogs
 			};
 
 
+
 			var books = config.Books;
 			var folder = Templates.Folder.GetPortionFilename(
 				libraryBookDto,
-				isFolder ? workingTemplateText : config.FolderTemplate);
+				//Path must be rooted for windows to allow long file paths. This is
+				//only necessary for folder templates because they may contain several
+				//subdirectories. Without rooting, we won't be allowed to create a
+				//relative path longer than MAX_PATH
+				Path.Combine(books, isFolder ? workingTemplateText : config.FolderTemplate));
 
+			folder = Path.GetRelativePath(books, folder);
 
 			var file
 				= template == Templates.ChapterFile