Add a Freeze/Unfreeze option to recent menus

BizHawk.Client.Common/RecentFiles.cs

@@ -20,6 +20,11 @@ namespace BizHawk.Client.Common
 		public int MAX_RECENT_FILES { get; set; }
 		public bool AutoLoad { get; set; }
 
+		/// <summary>
+		/// If true, the list can not change, or be cleared
+		/// </summary>
+		public bool Frozen { get; set; }
+
 		[JsonIgnore]
 		public bool Empty
 		{
@@ -65,11 +70,16 @@ namespace BizHawk.Client.Common
 		}
 
 		public void Clear()
+		{
+			if (!Frozen)
 			{
 				recentlist.Clear();
 			}
+		}
 
 		public void Add(string newFile)
+		{
+			if (!Frozen)
 			{
 				Remove(newFile);
 				recentlist.Insert(0, newFile);
@@ -79,8 +89,11 @@ namespace BizHawk.Client.Common
 					recentlist.Remove(recentlist.Last());
 				}
 			}
+		}
 
 		public bool Remove(string newFile)
+		{
+			if (!Frozen)
 			{
 				var removed = false;
 				foreach (var recent in recentlist.ToList())
@@ -95,6 +108,9 @@ namespace BizHawk.Client.Common
 				return removed;
 			}
 
+			return false;
+		}
+
 		public List<string> GetRecentListTruncated(int length)
 		{
 			return recentlist.Select(t => t.Substring(0, length)).ToList();

BizHawk.Client.EmuHawk/Extensions/ToolExtensions.cs

@@ -36,6 +36,10 @@ namespace BizHawk.Client.EmuHawk.ToolExtensions
 			clearitem.Click += (o, ev) => recent.Clear();
 			items.Add(clearitem);
 
+			var freezeitem = new ToolStripMenuItem { Text = recent.Frozen ? "&Unfreeze" : "&Freeze" };
+			freezeitem.Click += (o, ev) => recent.Frozen ^= true;
+			items.Add(freezeitem);
+
 			if (autoload)
 			{
 				var auto = new ToolStripMenuItem { Text = "&Autoload", Checked = recent.AutoLoad };