fix: only append '.added' suffix to watchdir files (#5705)

qt/AddData.h

@@ -14,6 +14,14 @@
 class AddData
 {
 public:
+    // what to do with the source file after adding the torrent
+    enum class FilenameDisposal
+    {
+        NoAction,
+        Delete,
+        Rename
+    };
+
     enum
     {
         NONE,
@@ -36,6 +44,18 @@ public:
     QString readableName() const;
     QString readableShortName() const;
 
+    void disposeSourceFile() const;
+
+    constexpr void setFileDisposal(FilenameDisposal disposal)
+    {
+        disposal_ = disposal;
+    }
+
+    constexpr auto& fileDisposal() const noexcept
+    {
+        return disposal_;
+    }
+
     static std::optional<AddData> create(QString const& str)
     {
         if (auto ret = AddData{ str }; ret.type != NONE)
@@ -51,4 +71,7 @@ public:
     QString filename;
     QString magnet;
     QUrl url;
+
+private:
+    std::optional<FilenameDisposal> disposal_;
 };