sanity check on last window

src/helpers/Workspace.cpp

@@ -119,4 +119,11 @@ void CWorkspace::moveToMonitor(const int& id) {
     wlr_ext_workspace_handle_v1_set_urgent(m_pWlrHandle, false);
 
     wlr_ext_workspace_handle_v1_set_name(m_pWlrHandle, m_szName.c_str());
-}
+}
+
+CWindow* CWorkspace::getLastFocusedWindow() {
+    if (!g_pCompositor->windowValidMapped(m_pLastFocusedWindow) || m_pLastFocusedWindow->m_iWorkspaceID != m_iID)
+        return nullptr;
+
+    return m_pLastFocusedWindow;
+}

src/helpers/Workspace.hpp

@@ -49,4 +49,6 @@ public:
     void            setActive(bool on);
 
     void            moveToMonitor(const int&);
+
+    CWindow*        getLastFocusedWindow();
 };