Fixes #97 missing jobs.

Implemented Equals(obj) functions for Chapter, DownloadChapter and DownloadNewChapters to check if jobs already exist.

Tranga/Chapter.cs

@@ -41,6 +41,13 @@ public readonly struct Chapter : IComparable
         return $"Chapter {parentManga.sortName} {parentManga.internalId} {chapterNumber} {name}";
     }
 
+    public override bool Equals(object? obj)
+    {
+        if (obj is not Chapter)
+            return false;
+        return CompareTo(obj) == 0;
+    }
+
     public int CompareTo(object? obj)
     {
         if (obj is Chapter otherChapter)

Tranga/Jobs/DownloadChapter.cs

@@ -43,4 +43,12 @@ public class DownloadChapter : Job
         downloadTask.Start();
         return Array.Empty<Job>();
     }
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is not DownloadChapter otherJob)
+            return false;
+        return otherJob.mangaConnector == this.mangaConnector &&
+               otherJob.chapter.Equals(this.chapter);
+    }
 }

Tranga/Jobs/DownloadNewChapters.cs

@@ -48,4 +48,12 @@ public class DownloadNewChapters : Job
         progressToken.Complete();
         return jobs;
     }
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is not DownloadNewChapters otherJob)
+            return false;
+        return otherJob.mangaConnector == this.mangaConnector &&
+               otherJob.manga.Equals(this.manga);
+    }
 }

Tranga/Jobs/JobBoss.cs

@@ -43,15 +43,7 @@ public class JobBoss : GlobalBase
     /// </summary>
     public bool ContainsJobLike(Job job)
     {
-        if (job is DownloadChapter dcJob)
-        {
-            return this.GetJobsLike(dcJob.mangaConnector, chapter: dcJob.chapter).Any();
-        }else if (job is DownloadNewChapters ncJob)
-        {
-            return this.GetJobsLike(ncJob.mangaConnector, ncJob.manga).Any();
-        }
-
-        return false;
+        return this.jobs.Any(existingJob => existingJob.Equals(job));
     }
 
     public void RemoveJob(Job job)

Tranga/Jobs/UpdateMetadata.cs

@@ -48,4 +48,13 @@ public class UpdateMetadata : Job
         this.progressToken.Cancel();
         return Array.Empty<Job>();
     }
+
+    public override bool Equals(object? obj)
+    {
+        
+        if (obj is not UpdateMetadata otherJob)
+            return false;
+        return otherJob.mangaConnector == this.mangaConnector &&
+               otherJob.manga.Equals(this.manga);
+    }
 }