UPD: replace with fspSaveableLoadable for better compatibility with various FileSources in TFileView.SaveConfiguration()

src/filesources/filesystem/ufilesystemfilesource.pas

@@ -818,7 +818,8 @@ end;
 function TFileSystemFileSource.GetProperties: TFileSourceProperties;
 begin
   Result := [
-    fspDirectAccess, fspListFlatView, fspNoneParent, fspSearchable
+    fspDirectAccess, fspListFlatView, fspNoneParent,
+    fspSearchable, fspSaveableLoadable
 {$IFDEF UNIX}
   , fspCaseSensitive
 {$ENDIF}

src/filesources/searchresult/usearchresultfilesource.pas

@@ -115,7 +115,7 @@ end;
 function TSearchResultFileSource.GetProperties: TFileSourceProperties;
 begin
   Result := inherited GetProperties;
-  Result -= [fspNoneParent, fspListFlatView];
+  Result -= [fspNoneParent, fspListFlatView, fspSaveableLoadable];
   Result += [fspDontChangePath, fspDontCreateDirectory, fspSearchable];
   if (fspDirectAccess in Result) then Result+= [fspLinksToLocalFiles];
 end;

src/filesources/ufilesourceproperty.pas

@@ -89,6 +89,11 @@ type
     }
     fspSearchable,
 
+    {en
+       Set, if the file source supports save to ConfigFile and load from ConfigFile.
+    }
+    fspSaveableLoadable,
+
     {en
       Set, if the file source has default columns view
     }

src/fileviews/ufileview.pas

@@ -2843,8 +2843,7 @@ begin
 
   for i := 0 to FileSourcesCount - 1 do
   begin
-    // Currently saves only FileSystem.
-    if FHistory.FileSource[i].IsClass(TFileSystemFileSource) then
+    if fspSaveableLoadable in FHistory.FileSource[i].Properties then
     begin
       EntryNode := AConfig.AddNode(HistoryNode, 'Entry');
       if FHistory.CurrentFileSourceIndex = i then