fix finding an entry for collating

BGS/LogEntry.cs

@@ -11,6 +11,11 @@ namespace NonaBGS.BGS {
         public string Station { get; set; }
         public string System { get; set; }
         public string Faction { get; set; }
+        /// <summary>
+        /// Whether this entry was manually added. Manually added entries are not deleted
+        /// when a new scan is made. Instead they are preserved.
+        /// </summary>
+        public bool ManuallyAdded { get; set; }
 
         /// <summary>
         /// Whether this entry only benefits the controlling faction or not, default: no

BGS/Objective.cs

@@ -16,6 +16,12 @@ namespace NonaBGS.BGS {
             get => entries;
             set => entries = value;
         }
+        public void Clear() {
+            if (entries == null) {
+                return;
+            }
+            entries.RemoveAll(x => !x.ManuallyAdded);
+        }
 
         public int Matches(LogEntry e) {
             int match_count = 0;

BGS/Report.cs

@@ -54,7 +54,7 @@ namespace NonaBGS.BGS {
             string current_station = null;
             string controlling_faction = null;
 
-            this.objectives.ForEach(x => x.LogEntries.Clear());
+            objectives.ForEach(x => x.Clear());
 
             foreach (var e in relevant) {
                 LogEntry entry = null;
@@ -145,12 +145,14 @@ namespace NonaBGS.BGS {
 
                 LogEntry existing = null;
 
+                existing = objective.LogEntries.Find(x => {
                         try {
-                    existing = objective.LogEntries.Find(x => x.CompareTo(entry) == 0);
+                            return x.CompareTo(entry) == 0;
                         } catch (NotImplementedException) {
-                    // Equivalent to not having found anything
+                            return false;
-                    existing = null;
                         }
+                    });
+
                 if (collate && existing != null) {
                     existing.Entries.Add(e);
                 } else if (!collate || existing == null) {

MainWindow.xaml.cs

@@ -264,6 +264,7 @@ namespace NonaBGS {
 
             CombatZone zone = new CombatZone();
 
+            zone.ManuallyAdded = true;
             zone.Faction = objective.Faction;
             zone.System = objective.System;
             zone.Station = objective.Station;