Store opened search tabs

PR #22163.
Closes #167.

src/gui/optionsdialog.h

@@ -73,6 +73,7 @@ class OptionsDialog final : public GUIApplicationComponent<QDialog>
         TAB_CONNECTION,
         TAB_SPEED,
         TAB_BITTORRENT,
+        TAB_SEARCH,
         TAB_RSS,
         TAB_WEBUI,
         TAB_ADVANCED
@@ -136,6 +137,9 @@ private:
     void loadRSSTabOptions();
     void saveRSSTabOptions() const;
 
+    void loadSearchTabOptions();
+    void saveSearchTabOptions() const;
+
 #ifndef DISABLE_WEBUI
     void loadWebUITabOptions();
     void saveWebUITabOptions() const;