notifications - max size tweaks

src/vs/workbench/browser/parts/notifications/media/notificationsCenter.css

@@ -8,7 +8,7 @@
 	width: 600px;
 	z-index: 1000;
 	right: 8px;
-	bottom: 32px; /* above status bar */
+	bottom: 30px; /* above status bar */
 	display: none;
 	background: #323232; /* TODO@notification make themable */
 	overflow: hidden;

src/vs/workbench/browser/parts/notifications/notificationsCenter.ts

@@ -205,6 +205,10 @@ export class NotificationsCenter extends Themable {
 				availableHeight -= 22; // adjust for status bar
 			}
 
+			if (this.partService.isVisible(Parts.TITLEBAR_PART)) {
+				availableHeight -= 22; // adjust for title bar
+			}
+
 			availableHeight -= (2 * 12); // adjust for paddings top and bottom
 
 			if (maxHeight > availableHeight) {