workspaces: restore monitor on re-plug

src/helpers/Workspace.hpp

@@ -51,7 +51,10 @@ class CWorkspace {
     bool m_bDefaultPseudo   = false;
 
     // don't destroy in sanity check
-    bool        m_bIndestructible = false;
+    bool m_bIndestructible = false;
+
+    // last monitor (used on reconnect)
+    std::string m_szLastMonitor = "";
 
     void        startAnim(bool in, bool left, bool instant = false);
     void        setActive(bool on);