Modal popups in views is not showing properly when toolbar tray is upon modal fixed

Closes #2822778

core/misc/dialog/dialog.position.js

@@ -128,7 +128,10 @@
       const uiDialog = $element
         .dialog('option', { resizable: false, draggable: false })
         .dialog('widget');
-      uiDialog[0].style.position = 'fixed';
+      uiDialog.css({
+        position: 'fixed',
+        zIndex: '1260',
+      });
       $(window)
         .on('resize.dialogResize scroll.dialogResize', eventData, autoResize)
         .trigger('resize.dialogResize');

[Ben Mullins]

Adding it directly to a style attribute in the tag makes it harder for themers to customize. This is probably better in a stylesheet