only empty top folders offer the menu entry to encrypt

in the contextual menu shown in files explorer will show encrypt menu

entry only for top folders that are non-encrypted and empty

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

[skip ci]

src/gui/socketapi/socketapi.cpp

@@ -1328,6 +1328,15 @@ QString SocketApi::FileData::folderRelativePathNoVfsSuffix() const
     return result;
 }
 
+bool SocketApi::FileData::isFolderEmpty() const
+{
+    if (FileSystem::isDir(localPath)) {
+        const auto nativeFolder = QDir{localPath};
+        return nativeFolder.isEmpty();
+    }
+    return false;
+}
+
 SyncFileStatus SocketApi::FileData::syncFileStatus() const
 {
     if (!folder)

src/gui/socketapi/socketapi.h

@@ -99,6 +99,8 @@ private slots:
         // Relative path of the file locally, without any vfs suffix
         [[nodiscard]] QString folderRelativePathNoVfsSuffix() const;
 
+        [[nodiscard]] bool isFolderEmpty() const;
+
         Folder *folder = nullptr;
         // Absolute path of the file locally. (May be a virtual file)
         QString localPath;