fixed button alignment on macOS

terminus-core/src/components/appRoot.component.pug

@@ -29,7 +29,7 @@ title-bar(
             )
                 i.fa([class]='"fa fa-" + button.icon')
                 
-        .drag-space(*ngIf='config.store.appearance.frame == "thin" && hostApp.platform != Platform.macOS')
+        .drag-space([class.persistent]='config.store.appearance.frame == "thin" && hostApp.platform != Platform.macOS')
             
         .btn-group
             button.btn.btn-secondary.btn-tab-bar(

terminus-core/src/components/appRoot.component.scss

@@ -55,15 +55,20 @@ $tab-border-radius: 4px;
     }
 
     &>.drag-space {
-        min-width: 100px;
-        flex: 1 0 25%;
+        min-width: 1px;
+        flex: 1 0 1%;
         -webkit-app-region: drag;
+
+        &.persistent {
+          min-width: 100px;
+          flex: 1 0 25%;
+        }
     }
 
     &.inset {
         padding-left: 85px;
     }
-    
+
     window-controls {
       margin-left: 10px;
     }