Trigger an alert when securityLevel is stripped

Co-authored-by: Sidharth Vinod <sidharthv96@gmail.com>

src/lib/util/state.ts

@@ -37,7 +37,10 @@ export const loadState = (data: string): void => {
 		state = JSON.parse(stateStr);
 		const mermaidConfig =
 			typeof state.mermaid === 'string' ? JSON.parse(state.mermaid) : state.mermaid;
-		delete mermaidConfig.securityLevel; // Prevent setting overriding securityLevel when loading state to mitigate possible XSS attack
+              if(mermaidConfig.securityLevel) {
+                  alert(`securityLevel was removed from config. Please add "securityLevel":"${mermaidConfig.securityLevel}" to your config if you trust the source of this Diagram`);
+		    delete mermaidConfig.securityLevel; // Prevent setting overriding securityLevel when loading state to mitigate possible XSS attack
+		}
 
 		state.mermaid = JSON.stringify(mermaidConfig, null, 2);
 	} catch (e) {