All: Improve rendering of Mermaid graphs

ElectronClient/app/gui/Navigator.jsx

@@ -17,7 +17,11 @@ class NavigatorComponent extends Component {
 	}
 
 	updateWindowTitle(title) {
+		try {
 			if (bridge().window()) bridge().window().setTitle(title);
+		} catch (error) {
+			console.warn('updateWindowTitle', error);
+		}
 	}
 
 	render() {

ReactNativeClient/lib/MdToHtml_Mermaid.js

@@ -15,7 +15,7 @@ class MdToHtml_Mermaid {
 		// Force a white background because the graphs can have various colours
 		// that may not be compatible with the current theme. Also make it
 		// inline-block so that the div is the same size as the content.
-		return '.mermaid { background-color: white; display:inline-block; }';
+		return '.mermaid { width: 100%; } .mermaid svg { background-color: white; }';
 	}
 
 	injectedJavaScript() {